OBS Studio 0.16.6

General Changes:
* Added option to use preview scaling via the right-click context menu.  This allows being able to zoom to a 1:1 preview in the preview pane.

Windows changes:
* Added support for Realsense devices (stargazer/etc).  This is an optional plugin and isn't installed by default.
* Improved program startup time
* Fixed a bug when using the QSV encoder where if frames were dropped due to network issues, frames would not stop dropping.
* Fixed a crash on startup with some AMD switchable graphics laptops.
