UI Overhaul

[exofunctor]

Changes on Main.unity and various prefabs. Moving waypoints around is now really easy and intuitive!

• [x] Make Right UI Sphere truly transparent
• [x] Add colliders on the right_controller and left_controller to fix various console errors
• [x] Highlight waypoints when the Right UI sphere touches them, and hide the Waypoint visualizer.
• [ ] Highlight the Right UI Sphere when grabbing a waypoint.
• [ ] Cleanup groundpoints when the mission finishes, or when waypoints are cleared
• [ ] Change the interface and laser pointers to Berkeley colors
• [ ] Add custom fonts (for UI labels)
• [ ] Cancel waypoint move by pressing the right grip (and just put it back to where it was grabbed)
• [ ] Highlight the right grip to show that it is possible to cancel moving the current waypoint
• [ ] Visualize where the waypoint is going to be places before placing it
• [ ] Cancel waypoint placement by pressing the right grip
• [ ] Highlight the right grip to show that it is possible to cancel placing the current waypoint