System Audio, Custom Cursor, Audio Mixing & Fixes/Enhancements - Cap

Experimental: System audio capture
Experimental: Cursor capture & smoothing
Audio levels can now be adjusted in the editor
Stereo behaviour for mic audio can be adjusted in the editor (Stereo, Mono L or Mono R)
Opening .cap file now automatically opens editor (or video file for instant mode recordings)
Improved slider interactivity
Fixed export dialog upload state
Improved audio/video sync