Split up the course sort into four sorts: all courses, and one ofr each

course mode.

Fix score not tweening when switching sorts via the menu.

Rename SORT_SORT to SORT_MODE.  Add metrics to define what
sorts are listed.  This can also change modes, but this has only been
tested for changing the play mode, not the play style.

stepmania/src/GameConstantsAndTypes.cpp

@@ -121,6 +121,9 @@ static const char *SongSortOrderNames[NUM_SORT_ORDERS] = {
 	"HARD METER",
 	"SORT",
 	"COURSES",
+	"NONSTOP",
+	"ONI",
+	"ENDLESS",
 	"ROULETTE"
 };