Change mac package name to just 'OBS'
Update libdshowcapture to the latest version
Fix cmake app package issue

Currently the Info.plist file names the app package as OBS.app and cmake
is trying to use 'OBS Studio.app'.  I renamed it to OBS for the time
being just because we don't currently have actual studio interface yet.
Rename cpack description summary (also fix typo)
Fix scene editing for device pixel ratios ≠ 1

Fixes #177
Localization correction for image plugin

Closes #181
mac-avcapture: Remove debug code
libobs/media-io: Handle VIDEO_CS_DEFAULT in video_format_get_parameters
Reset blend state for image source

This is more of a temporary fix for the time being, it needs to handle
blend state changes better, perhaps via push/pop of state changes
No need to initialize map value to 0 (bug fix)

There's no need to initialize the map value to 0.  What was happening is
that obs_scene_add was adding a ref to a non-existent value, which
simply created it and added 1, which is perfectly fine.  Then,
obs_add_source would set the ref to 0, overwriting the existing value.

So this meant that if you didn't call them in the right order, it
wouldn't work properly, and would break, which was pretty stupid.

Turns out that if you access a map value that doesn't exist, it'll
create one with the default constructor of that type.  In this case, int
will initialize to 0, which was exactly what we wanted in the first
place, and defeats the purpose of even needing to initialize the value
to 0.  So, there's no need to manually set it to 0 in
OBSBasic::SourceAdded, or worry about the order in which the functions
are called.

Just goes to show you have to be careful with reference counting.