OBS Multiplatform 0.6.3

General Changes:
* Added some preliminary doxygen configuration files to the repository (leonhard)
* Added 'rename' entry to scenes context menu (Palana)
* Added 'remove' entry to scenes context menu (Palana)
* Fixed 'remove' (del) shortcut to work on both scenes and sources (Palana)
* Fixed a crash on startup that could happen due to certain font files (Jim)
* Fixed a major audio/video sync bug, and fixed various potential issues with sync in general (Jim/leonhard)
* Made it so that auto-updates use the delta update data if available (Palana)
* Made it so instead of renaming, double-clicking a source now opens the properties (Palana)

Mac-specific:
* Fixed an issue where syphon would be partially transparent, and added an option to enable transparency if desired (Palana)
* Fixed 'remove' context shortcut on OSX (Palana)
* Made various improvements to how syphon captures, and it will now remember and capture the last program it was set to capture (Palana)

Linux-specific:
* Added a "Use system timing" option to v4l2 plugin that can optionally fix some frame timing problems that can occur with certain linux drivers (Jim)
* Fixed an issue where v4l2 plugin frames could buffer more than intended when switching devices, causing the output to appear more and more delayed (leonhard)
* Made it so that the v4l2 plugin detects device disconnection/reconnection, and will reconnect the device and update properties accordingly when that occurs (leonhard)
