WMR default binding, Toggle Chaperone Action, frame timing graph, prox sensor back-end (#182)

* perf graph overlay/checkbox added

* added toggle Chaperone action

* toggle chaperone non-functional

* fixed chaperone toggle action const to once

* Added Proximity Sensor Action back-end, not implemented via logic Until fixed by valve

* added default WMR controller profile

* formated

* formated steamvrtabcontroller.h

* fixed un-intended change

src/overlaycontroller.h

@@ -134,6 +134,7 @@ private:
     void processMediaKeyBindings();
     void processMotionBindings();
     void processPushToTalkBindings();
+    void processChaperoneBindings();
 
 public:
     OverlayController( bool desktopMode, bool noSound, QQmlEngine& qmlEngine );