Add .desktop file for obs on linux
Install desktop file and application icon on linux
Update information provided by pulseaudio plugin to pulse.

The plugin now uses the generic name "OBS" to identify itself
to pulseaudio.

Until now the pulseaudio plugin used a placeholder icon for the
mixer to display. Now that we have a real icon installed to the
system we can use that instead.
Merge pull request #224 from fryshorts/linux-shortcut

Add menu entry for obs on linux
Merge pull request #226 from fryshorts/pulse-input

Update information provided by pulseaudio plugin to pulse.
(API Change) Rename obs_sceneitem_info structure

Change obs_sceneitem_info structure to obs_transform_info - this
structure will not just be used with scene items in the future.
(API Change) Rename obs_source_get(/release)frame

Renamed functions:
- obs_source_getframe (rename to obs_source_get_frame)
- obs_source_releaseframe (rename to obs_source_release_frame)

For the sake of consistency and helping to get rid of the "squishy
function name" issue
(API Change) Rename 'source_frame' + related

For the sake of naming consistency with the rest of obs.h, prefix this
structure and associated functions with obs_.

Renamed structures:
- struct source_frame (now obs_source_frame)

Renamed functions:
- source_frame_init (now obs_source_frame_init)
- source_frame_free (now obs_source_frame_free)
- source_frame_create (now obs_source_frame_create)
- source_frame_destroy (now obs_source_frame_destroy)

Affected functions:
- obs_source_output_video
- obs_source_get_frame
- obs_source_release_frame
(API Change) Rename order_movement

Prefix with obs_ for the sake of consistency

Renamed enums:
- order_movement (now obs_order_movement)

Affected functions:
- obs_source_filter_setorder
- obs_sceneitem_setorder
(API Change) Rename allow_direct_render enum

For the sake of consistency, changed allow_direct_render to
obs_allow_direct_render
(API Change) Rename filtered_audio structure

Reanmed filtered_audio to obs_audio_data, to improve the naming and
prefix with obs_ for the sake with consistency with the rest of the API
(API Change) Rename source_audio structure

Rename source_audio to obs_source_audio to make it more consistent with
the rest of the API
Don't use "type" of source, use "id" of source

The naming here is a poor choice, a source type determines if a source
is either a regular input, a filter, or a transition.  The ID is the
actual unique identifier of a source.
(API Change) Split obs_source_gettype

Changed:
- obs_source_gettype
To:
- enum obs_source_type obs_source_get_type(obs_source_t source);
- const char *obs_source_get_id(obs_source_t source);

This function was inconsistent for a number of reasons.  First, it
returns both the ID and the type of source (input/transition/filter),
which is inconsistent with the name of "get type".  Secondly, the
'squishy' naming convention which has just turned out to be bad
practice and causes inconsistencies.  So it's now replaced with two
functions that just return the type and the ID.
(API Change) Un-squish obs_sceneitem_*

For the sake of API consistency, remane all obs_sceneitem_t and obs_sceneitem_* functions to obs_scene_item_*

Previous names:                  New names:
-----------------------------------------------------------
obs_sceneitem_t                  obs_scene_item_t
obs_sceneitem_addref             obs_scene_item_addref
obs_sceneitem_release            obs_scene_item_release
obs_sceneitem_remove             obs_scene_item_remove
obs_sceneitem_getscene           obs_scene_item_get_scene
obs_sceneitem_getsource          obs_scene_item_get_source
obs_sceneitem_select             obs_scene_item_select
obs_sceneitem_selected           obs_scene_item_selected
obs_sceneitem_setpos             obs_scene_item_set_pos
obs_sceneitem_setrot             obs_scene_item_set_rot
obs_sceneitem_setscale           obs_scene_item_set_scale
obs_sceneitem_setalignment       obs_scene_item_set_alignment
obs_sceneitem_setorder           obs_scene_item_set_order
obs_sceneitem_getpos             obs_scene_item_get_pos
obs_sceneitem_getrot             obs_scene_item_get_rot
obs_sceneitem_getscale           obs_scene_item_get_scale
obs_sceneitem_getalignment       obs_scene_item_get_alignment
obs_sceneitem_get_info           obs_scene_item_get_info
obs_sceneitem_set_info           obs_scene_item_set_info
obs_sceneitem_get_draw_transform obs_scene_item_get_draw_transform
obs_sceneitem_get_box_transform  obs_scene_item_get_box_transform
(API Change) Remove obs_graphics()

API Removed:
- graphics_t obs_graphics();
Replaced With:
- void obs_enter_graphics();
- void obs_leave_graphics();

Description:
  obs_graphics() was somewhat of a pointless function.  The only time
that it was ever necessary was to pass it as a parameter to
gs_entercontext() followed by a subsequent gs_leavecontext() call after
that.  So, I felt that it made a bit more sense just to implement
obs_enter_graphics() and obs_leave_graphics() functions to do the exact
same thing without having to repeat that code.  There's really no need
to ever "hold" the graphics pointer, though I suppose that could change
in the future so having a similar function come back isn't out of the
question.

Still, this at least reduces the amount of unnecessary repeated code for
the time being.
(API Change) Unsquish libobs (base) names

Previous names:             New names:
-----------------------------------------------------------
obs_view_setsource          obs_view_set_source
obs_view_getsource          obs_view_get_source
obs_source_getdisplayname   obs_source_get_display_name
obs_source_getwidth         obs_source_get_width
obs_source_getheight        obs_source_get_height
obs_filter_getparent        obs_filter_get_parent
obs_filter_gettarget        obs_filter_get_target
obs_source_filter_setorder  obs_source_filter_set_order
obs_source_getsettings      obs_source_get_settings
obs_source_getname          obs_source_get_name
obs_source_setname          obs_source_set_name
obs_source_setvolume        obs_source_set_volume
obs_source_getvolume        obs_source_get_volume
obs_scene_getsource         obs_scene_get_source
obs_scene_fromsource        obs_scene_from_source
obs_scene_findsource        obs_scene_find_source
obs_output_getdisplayname   obs_output_get_display_name
obs_output_getname          obs_output_get_name
obs_encoder_getname         obs_encoder_get_name
obs_service_getdisplayname  obs_service_get_display_name
obs_service_getname         obs_service_get_name
(API Change) Use 'get' convention in libobs (base)

Instead of having functions like obs_signal_handler() that can fail to
properly specify their actual intent in the name (does it signal a
handler, or does it return a signal handler?), always prefix functions
that are meant to get information with 'get' to make its functionality
more explicit.

Previous names:             New names:
-----------------------------------------------------------
obs_audio                   obs_get_audio
obs_video                   obs_get_video
obs_signalhandler           obs_get_signal_handler
obs_prochandler             obs_get_proc_handler
obs_source_signalhandler    obs_source_get_signal_handler
obs_source_prochandler      obs_source_get_proc_handler
obs_output_signalhandler    obs_output_get_signal_handler
obs_output_prochandler      obs_output_get_proc_handler
obs_service_signalhandler   obs_service_get_signal_handler
obs_service_prochandler     obs_service_get_proc_handler
(API Change) Unsquish API callback names

Renamed:                    To:
-------------------------------------------------------
obs_source_info::getname    obs_source_info::get_name
obs_source_info::getwidth   obs_source_info::get_width
obs_source_info::getheight  obs_source_info::get_height
obs_output_info::getname    obs_output_info::get_name
obs_encoder_info::getname   obs_encoder_info::get_name
obs_service_info::getname   obs_service_info::get_name
(API Change) Use 'get' convention: API callbacks

Renamed:                       To:
-------------------------------------------------------
obs_source_info::defaults       obs_source_info::get_defaults
obs_source_info::properties     obs_source_info::get_properties
obs_output_info::defaults       obs_output_info::get_defaults
obs_output_info::properties     obs_output_info::get_properties
obs_output_info::total_bytes    obs_output_info::get_total_bytes
obs_output_info::dropped_frames obs_output_info::get_dropped_frames
obs_encoder_info::defaults      obs_encoder_info::get_defaults
obs_encoder_info::properties    obs_encoder_info::get_properties
obs_encoder_info::extra_data    obs_encoder_info::get_extra_data
obs_encoder_info::sei_data      obs_encoder_info::get_sei_data
obs_encoder_info::audio_info    obs_encoder_info::get_audio_info
obs_encoder_info::video_info    obs_encoder_info::get_video_fino
obs_service_info::defaults      obs_service_info::get_defaults
obs_service_info::properties    obs_service_info::get_properties