feat: local volume

VoidLink/Database/TemporarySettings.h

@@ -33,6 +33,7 @@
 @property (nonatomic, retain) NSNumber * touchMoveEventInterval;
 @property (nonatomic, retain) NSNumber * touchPointerVelocityFactor;
 @property (nonatomic, retain) NSNumber * gyroSensitivity;
+@property (nonatomic, retain) NSNumber * localVolume;
 @property (nonatomic, retain) NSNumber * emulatedControllerType;
 @property (nonatomic, retain) NSNumber * mousePointerVelocityFactor;
 @property (nonatomic, retain) NSNumber * pointerVelocityModeDivider;