Demo patch #2 -- Gamepad support!

Second patch of the demo here we go!

• Full gamepad support! Aiming works and feels good now :3

• You can pause in the planning phase now

• Rebinding the "brain jump" key now also rebinds related keys (reset on death, end planning, next level)

• The "You Died" message is more readable

• WASD and slow mo instructions are more aggressive (they wiggle) which should help people miss them less.

• Valve no longer needs to be held to flood the pump (tapping it will be sufficient)

The weekend's over so output will slow down for a bit. Priorities for the next patch are improving support for other resolutions and introducing one level between 1.1 and 1.2 to make tutorialization slightly more gradual -- 1.2 is intentionally a difficulty spike, but I want players to have practice comfortably jumping in all directions before they get tested there.

Also want to enable gamepad rebinding.

As always, many of these changes wouldn't exist without your feedback, so thank you very much!