InputCommon: Introducing the "Dynamic Input Texture". Configuration links an emulated input action to an image based on what host key is defined for that emulated input. Specific regions are called out in configuration that mark where to replace an input button with a host key image.

Source/Core/VideoCommon/TextureCacheBase.h

@@ -205,6 +205,7 @@ public:
   bool Initialize();
 
   void OnConfigChanged(const VideoConfig& config);
+  void ForceReload();
 
   // Removes textures which aren't used for more than TEXTURE_KILL_THRESHOLD frames,
   // frameCount is the current frame number.