Add gdc support
Clean up the build a bit
Add a missing break for a case statement
Minor whitespace nits
Use a signed integer for the actor index

It underflowed in the code and caused an out-of-range exception.
Revert getState stuff for MouseAndPad
More char[] -> string parameter changes
Finish implementing GLU replacements
Fix some typos from gluPerspective replacement
Fix high score reading and writing