Define named constant for null sprite locations
Add the logo window paint function and move some constants to addresses
Fix comment relating to prefix for expansion
Implement exit button paint and mouseup
Use colour defines over magic numbers
Merge branch 'title-logo-paint' of https://github.com/benpye/OpenRCT2 into benpye-title-logo-paint
draw OpenRCT2 text and version on title screen
Add game flag for development only below tree height.
Merge pull request #31 from kevinburke/game-flag

Add game flag for development only below tree height.
Merge remote-tracking branch 'upstream/master'