Re-Add color overlay (#311)

* fixed Chaperone toggle, toggle state on launch

* made update rates based on variable frame rate assuming 90 default

* added overlay color back in

* fixed opacity value not synching

* updated to ovr 1.8.19

* fixed license issue

* rolled back ovr update

* fixed overlay toggle state, formatting, and clamped max opacity to .85%

src/tabcontrollers/AudioTabController.cpp

@@ -20,6 +20,8 @@ void AudioTabController::initStage1()
     audioManager.reset( new AudioManagerDummy() );
 #endif
     audioManager->init( this );
+    m_k_audioSettingsUpdateCounter
+        = utils::adjustUpdateRate( k_audioSettingsUpdateCounter );
     m_playbackDevices = audioManager->getPlaybackDevices();
     m_recordingDevices = audioManager->getRecordingDevices();
     findPlaybackDeviceIndex( audioManager->getPlaybackDevId(), false );
@@ -165,7 +167,7 @@ void AudioTabController::eventLoopTick()
         return;
     }
 
-    if ( settingsUpdateCounter >= k_audioSettingsUpdateCounter )
+    if ( settingsUpdateCounter >= m_k_audioSettingsUpdateCounter )
     {
         vr::EVRSettingsError vrSettingsError;
         char mirrorDeviceId[1024];