Implemented switching A and B buttons, closing #2034

getButtonState() now have an option int/bool argument to swap the result via XOR

source/Core/Drivers/Buttons.hpp

@@ -27,7 +27,7 @@ enum ButtonState {
 };
 
 // Returns what buttons are pressed (if any)
-ButtonState getButtonState();
+ButtonState getButtonState(bool revert=0);
 // Helpers
 void waitForButtonPressOrTimeout(TickType_t timeout);
 void waitForButtonPress();