Make settings window slightly smaller

For people with tiny screens and high font size settings.
Revert "Make settings window slightly smaller"

This reverts commit fd7eeb04c08ba8e5923fdbfa3575a46b823e2692.
Fix a bug with interleaving video/audio

This should finally fix the out-of-sync issues with hardware encoders.
The data was not always properly being interleaved, and this should fix
the issue (again).  (The previous time I attempted this it didn't quite
work out as I had wanted)
Lock sound data mutex when accessing sound data
Fix compile issue
Add OSGetDefaultVideoSavePath to OBSApi

Returns the path to the "My Videos" directory (with optional suffix)
if available
Set default file save path if available
Add "Open Recordings Folder" file menu item
Automatically select last recording when opening the recordings directory
Fix NVENC with nvidia drivers 340 and higher