Added a get_key method to GameEngine to wrap messy key checks, locked key states to be False by default
Fixed docs to include new functions
PYSTROKE v0.07! Added a locals module which keeps track of various flags (at present just the state-switch/quit flags for Game and GameEngine)
Added FPS as a default property of GameEngine, added default direction vector to Vex, accessible by rel_dir_vec() and rotating whenever the Vex does
Regenerated docs for new functionality
Changed Vex.move() into two methods - move_abs (for when the x and y are unlinked) and move_rel (for when the x and y are properties of the same vector)

This allows calculated directions (i.e., vectors) to be fed easily into a move method, without eliminating the extra calculation done for unlinked x/y values