feat: better first person

[orangishcat]

This is pretty low priority and can wait until after 1.6 (although please release 1.6 sometime)

• Panel.zoomTarget always set to 1 when in immersive camera
• Mouse cursor is hidden and reset to center of screen every frame during immersive camera to ensure that it never hits the window edge
  • There's some weirdness with testing with two game instances, hopefully this is the cause
• Added f to tilt camera in third person for better visibility
• Added c to zoom in first person
• Added controls into the controls menu
• Better arc bullet aim in immersive camera
• Set out of bounds color to light intensity (doesn't fix the shading issue, but makes it less noticeable. Will have to do for now)