Makefile: Fixed debug/warn targets on Windows, added SDL2_ttf
Removed -mwindows so stdout works
Major progress
entity.c: Added rect collisions, level boundaries
input.c: Space launches a ball, can move plank left/right
level.c: Now loads from text files
It is now possible to lose the game
Winning the game loads the next level
main.c: Resolution changed from fullscreen to 800x600