SlingboxLib: Fix alternative CSlingbox constructor

CSlingbox::CSlingbox(const char * szAddress, unsigned int uiPort /* = 5001 */) {
  // Call default constructor
  CSlingbox();
  ...
}

"CSlingbox();" - object is created and immediately removed.
Therefore with CSlingbox(const char * szAddress, unsigned int uiPort /* = 5001 */) class members will not be initialized.
[gui] adds new method GetSelectedItemPath() to CGUIViewControl
[pvr] fix: remember the wrong selected item path if you close the channel osd

If you close the channel osd on a different group than the current playing group without switching to a channel of this group, the wrong selected item path is stored in the global variable. This fix it by setting the proper selected item of the current playing group.
[pvr] use new GetSelectedItemPath() method in CGUIWindowPVRBase
[bluray][files] Add new BlurayFile class.
[pvr] fix unnecessary creation of new CPVRChannel instances
CacheStrategy: remove usage of emulated win32 functions, switch to internal VFS
[builtin] fix activatewindow if directory path differs

After #5081 the built-in "activatewindow" does not work if you stay for example in the video window and you want to activate the same window with a different path.
This fixes the issue by comparing the directory path of the current active window with the given directory path of activatewindow.
URIUtils::IsInPath needs to check if the base path isn't empty, fixes texturecache when there is no skin loaded
Hide dialogs for library clean/scan by default if automatically triggered.

This doesn't show dialogs and progress bars for library clean or scan if
initiated by an add-on or by a JSON-RPC client by default, as they're assumed
to be automatically triggered.

*library.backgroundupdate is still supported to let the user choose to not show
the progress even if user-initiated as it may take a while.
json-rpc: Add "showdialogs" to Audio/VideoLibrary.Clean/Scan. Bump to 6.19.0.
AML: Send h263 to software decoding sooner

* AMLCodec was handling it prior
https://github.com/xbmc/xbmc/blob/master/xbmc/cores/dvdplayer/DVDCodecs/Video/AMLCodec.cpp#L1225

Signed-off-by: Brandon McAnsh <brandonm@matricom.net>
edit control: fix T9/SMS input for INPUT_TYPE_FILTER controls
changed: Log http error when Curl fillbuffer fails
Put frameTimer on the stack instead
Merge pull request #5324 from anaconda/cleandb-background
[guilib] - setvideoresolution needs to be called from mainthread to work
on most platforms - fixes #15115
Merge pull request #5512 from arnova/curl_errors

changed: Log http error when Curl fillbuffer fails
Merge pull request #5500 from Montellese/fix_edit_control_filter_sms_input
fixed: wrong label used when adjusting 'contrast' (closes #15483)