Mark menu entries for Qt application menu mangling on OSX
(API Change) obs_reset_video: Use return codes

Changed API functions:
libobs: obs_reset_video

Before, video initialization returned a boolean, but "failed" is too
little information, if it fails due to lack of device capabilities or
bad video device parameters, the front-end needs to know that.

The OBS Basic UI has also been updated to reflect this API change.
Check for valid sizes when initializing video
If Direct3D doesn't initialize, try OpenGL
Add color property implementation
Add OBS_TEXT_MULTILINE for text obs properties
Remove unnecessary compiler flag
Add searching for plugins instead of a hardcoded list
Remove lib prefix from plugins
Support loading plugins from subdirs