Merge pull request #421 from ImperatorPrime/master

Move strippublic.h into JKA source tree.
[SP] Don't display unknown command for g_svcmds stuff when cheats are not on.
[SP] Improve SP's /saber command to display current values.
[SP] Fix incorrect reference operator in SDL GLimp_CompareModes. (Already fixed in MP)
[SP] Remove some unused cvars.
[SP] g_speederControlScheme removed CVAR_ROM status as CVAR_ROM and CVAR_ARCHIVE are mutually exclusive.
Migrated JK2 to JKA qcommon.
Replaced some JK2 header files with their JKA equivalents.
Replaced JK2 gameinfo with JKA equivalent.