future-proof against potential byte overflow problems

git-svn-id: svn://svn.icculus.org/fs2open@11022 387891d4-d844-0410-90c0-e4c51a9137d3
formatting

git-svn-id: svn://svn.icculus.org/fs2open@11023 387891d4-d844-0410-90c0-e4c51a9137d3
make unboxing explicit to guard against mysterious potential problems

git-svn-id: svn://svn.icculus.org/fs2open@11024 387891d4-d844-0410-90c0-e4c51a9137d3
set the PATH to include the working directory

git-svn-id: svn://svn.icculus.org/fs2open@11025 387891d4-d844-0410-90c0-e4c51a9137d3
only launch things in the shell when running on Windows

git-svn-id: svn://svn.icculus.org/fs2open@11026 387891d4-d844-0410-90c0-e4c51a9137d3
MageKing17's patch: add door keys and quick start region, and fix single player / multiplayer description toggling
also fix two warnings regarding int and boolean conversions

git-svn-id: svn://svn.icculus.org/fs2open@11027 387891d4-d844-0410-90c0-e4c51a9137d3