add OSC visual feedback & corresponding menu option.

adjust menu option layout for iPhone

Limelight/Database/TemporarySettings.h

@@ -36,6 +36,7 @@
     CODEC_PREF_HEVC,
     CODEC_PREF_AV1,
 } preferredCodec;
+@property (nonatomic) BOOL oscVisualFeedback;
 @property (nonatomic) BOOL useFramePacing;
 @property (nonatomic) BOOL multiController;
 @property (nonatomic) BOOL swapABXYButtons;
@@ -50,7 +51,6 @@
 @property (nonatomic) BOOL showKeyboardToolbar;
 @property (nonatomic) BOOL allowPortrait;
 
-
 - (id) initFromSettings:(Settings*)settings;
 
 @end