feat: remember menu section fold state

VoidLink/Database/TemporarySettings.h

@@ -74,6 +74,7 @@
 @property (nonatomic, retain) NSNumber * graphOpacity;
 @property (nonatomic, retain) NSNumber * renderingBackend;
 @property (nonatomic) BOOL sendDummyEvent;
+@property (nonatomic) BOOL rememberFoldState;
 @property (nonatomic, retain) NSNumber * framePacingMode;
 
 - (id) initFromSettings:(Settings*)settings;