Replace magic numbers with constants and centralize settings update counters. Rename actions manifest localization from "en" to "en_US" (Thanks Ykeara)
Parameters with the same name as class members are ripe for introducing
bugs. The fact that the "this->" syntax is optional creates confusion
for maintaining programmers who can only guess at the intention.
Added chaperone profiles
Added separate supersampling sliders for applications/compositor
Added asynchronous reprojection on/off switch
Merged in Microphone Control Overlay
Added Push-to-Talk profiles
Updated to OpenVR 1.0.3
Requires at least SteamVR beta 1477423729.