MacOSX/Framework/VLCEventManager: Forgot in previous commit. Code clean up/documentation.  Standardized the way duplicate notifications are consolidated.

MacOSX/Framework/VLCEventManager: Code clean up/documentation.  Standardized the way duplicate notifications are consolidated.

MacOSX/Framework/Examples/test: Don't waste time getting the length of the video while we're doing a drag & drop operation.

shouldn't break anything (tested on mp4/ts files, rtp stream and http/ts
stream). Files play correctly and MP4Box/ffmpeg recognize them
correctly. should fix #1384

MacOSX/Framework: Remove all references to fullscreen mode, it should be the host application's responsibility to transition between fullscreen and window mode.

input/input.c: Define DEMUX_CAN_SEEK and correctly set "seekable" accordingly. (This could introduce regression such as seekable item no more seekable, but I should have greped enough...).

video_output/opengllayer.m: Hopefully fix the tearing issues by correctly updating textures, and using a nice trick to save the current opengl context. (Note, we can't draw to it directly).

MacOSX/VLC_app/VLCMainWindow.m: Set noAutoresizeColumn and MarkerFollowCell for the categories List.

MacOSX/Framework/Examples/test/Controller.m: Updated example to comply with latest framework improvements.

libvlc_video_take_snapshot API change (it would be nice to grep the
VLC source, or at least the bindings directory, for the symbol when
doing such a change).

MacOSX/Framework/VLCMediaPlayer.m: Missing a comment before the detach to match the attach of libvlc_MediaInstancePositionChanged.