Non-VR Phone mode cannot use both GazeInputModule and on-screen buttons at once

[scscgit]

Enabling the GazeInputModule (which uses CardboardReticle from the Cardboard package) in the Non-VR Phone mode can be achieved by disabling the Vr Mode Only checkbox. It will be applied automatically after changing the value on this line to false: GameInputManager.cs#L104

The problem is that doing this would disable all on-screen buttons, currently consisting of MobileJoystick and JumpButton. They should be able to work together. The GazeInputModule does not necessarily have to work by tapping the screen, it can have its own on-screen button too. The Main Menu accessed using ESC key is also currently using the workaround of disabling this input mode to allow all buttons to be pressed.