Add setting to swap A<->B and X<->Y buttons (#513)

* Added toggle for swapping A<->B and X<->Y buttons to enable proper button mapping for combined Joy-Cons in iOS16, where iOS level remapping is not supported and pushing Switch B (bottom face button) sends Xbox B (right face button) instead of Xbox A (bottom face button), etc.  Allows user to select between current behavior (button letter matches output) and muscle-memory behavior (face button pressed matches location of face button output)

Limelight/Database/DataManager.h

@@ -21,6 +21,7 @@
                 onscreenControls:(NSInteger)onscreenControls
                    optimizeGames:(BOOL)optimizeGames
                  multiController:(BOOL)multiController
+                 swapABXYButtons:(BOOL)swapABXYButtons
                        audioOnPC:(BOOL)audioOnPC
                          useHevc:(BOOL)useHevc
                   useFramePacing:(BOOL)useFramePacing