Add some potentially useful macros
Add rotational acceleration support
Retabify
Fix inclusion of glib headers
Allow resetting the game when the player has died
make clean: Delete the actual .o files in src
Fix check for aliveness
Randomize player starting position

Player starts in one of the four quadrants, offset by a margin so they
don't ever sit right on the edge.
Don't permit reversing.

Being able to reverse makes the game far too easy.
Fix UI display to indicate level status
Make segments a bit wider
Make game slightly harder at each level
Reindent according to code style settings
Add various parameters that get incremented on new levels