New controls (#106)

* make theme delete function general and clean it up

* add steam big picture-like controls

* aesthetic changes

include/common.h

@@ -63,7 +63,7 @@ enum TextureID {
     TEXTURE_BATTERY_CHARGE,
     TEXTURE_QR,
     TEXTURE_PREVIEW,
-    TEXTURE_SELECT_BUTTON, //Add the new select texture
+    TEXTURE_SELECT_BUTTON,
 
     TEXTURE_ICON, // always the last
 };