What changed in EDuke32, build by build

Remove guard against building in C++ mode. We now support both!

Fix build, part 13. Disable inaccurate assertion.

Fix build, part 12. playerswhenstarted --> g_mostConcurrentPlayers

Fix build, part 11. g_spriteDeleteQueueSize --> g_deleteQueueSize

Fix build, part 10. g_currentFrameRate --> g_frameRate

Fix build, part 9. ScriptQuotes --> apStrings

Fix build. BUILD_LUNATIC.

Fix unused-parameter warnings.

Fix discarded-qualifiers warnings.

Fix cast-qual warnings having to do with L_RunString.

Expose all structs to inline access. Tiledata and paldata are still to-do.

Properly implement rotatesprite16 by adding ROTATESPRITE_FULL16 to orientation.