Mac build available

The mac version of the game is up now. I haven't listed mac support on the store page yet because it's currently mostly untested, and would be grateful if people could let me know whether it works for them.

Other changes: -It's now possible to join games via steam friends/invites while the game is running. -Hyperdrive looks nicer and has better controls. -The game now gives a warning if video memory is low. -Gamepad input detection now only runs while a menu is up, which should stop the game from switching to gamepad mode incorrectly.