Main Menu, MissileController / FirstMissileScript change.

Added MissileController, FirstMissileScript changes:
* Added MissileController missileSpeed public variable - sets the
default speed of newly spawned missile. Default is set to -30, what we
have been using.
* FirstMissileScript missileSpeed public variable. Changing it will
change how fast the missile goes.
* Main Menu up! Still setting up other things.
* Added debug checkers for RocketScript.