Experimental support for Non-VR: Flatscreen, Gamepad, Keyboard+Mouse

- added support for non-VR (flatscreen, gamepad, keyboard+mouse), toggled in Options -> Visuals -> Use XR
- added keyboard+mouse input remapping to Options -> Controls -> Keymap
- added mouse menu and game sensitivity sliders to Options -> Controls -> Mouse
- added laser pointer to right claw
- moved scrolling/map rotation to left hand stick
- changed colors and positions of compass arrows for clarity of orientation (Up/Down -> Up/Forward/Right)
- added gravity arrow to map
- added tutorial state for targeting the second item
- adjusted tutorial tips using current key mapping and controller
- added icons to simplify minimap tutorial tip
- replaced rock in tutorial with sword to prevent accidental throws and ensure second item is targeted next
- fixed enemy hurtboxes activating teleporter
- applied camera rotation to timekeeper timescale
- increased volume of floaters
- enabled fullscreen desktop mirror by default