Cleaned up ScriptMaster scode and split ScriptThread/LightStyleClass into separate files

code/game/gamescript.cpp

@@ -26,6 +26,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "gamescript.h"
 #include "compiler.h"
 #include "scriptmaster.h"
+#include "scriptthread.h"
 #include "level.h"
 
 static unsigned char *current_progBuffer = NULL;