refactor: adopt UIScene lifecycle

feat: add initial support for pip

feat: add setting toggle for pip

fix: let os handle invokation of pip which is more reliable

fix: UIScene compatibility with airplay

fix: black screen on external display when on app view and streaming

fix: incorrect window size when launched directly on external display

fix: wrong resolution shown in settings when in stream session

Enable gamemode flag for iOS18+

Explicitly enters pip mode when in background

VoidLink/Database/TemporarySettings.h

@@ -46,6 +46,7 @@
     CODEC_PREF_AV1,
 } preferredCodec;
 @property (nonatomic) BOOL enableYUV444;
+@property (nonatomic) BOOL enablePIP;
 @property (nonatomic) BOOL reverseMouseWheelDirection;
 @property (nonatomic, retain) NSNumber * asyncNativeTouchPriority;
 @property (nonatomic) BOOL useFramePacing;