Update V1.1

I updated the game two days after the submission date, and on the day that judging starts, in order to make some changes that I hope will make the game less confusing and a bit more approachable:

• Updated some files in the robot's filesystem. Specifically, I removed mission.txt as it was redundant and superseded by readme.txt, and I updated combat.txt as well.
• Hitting a heart that does not match your resonant frequency will shake and flash the res.freq. display. Hopefully people will make the connection quicker.
• Added an option for WASD and mouse aim. Mouse aim is pretty much just for if you're frustrated with the game's intended control scheme.
• There's also an option to use tank controls, as a little homage to the games that inspired this :p.
• The tutorial teaches you how to ping. The heart on the starting room now starts invisible.