Macro update, roam mon annotations

Updated map and mapgroup macros to get around an rgbds bug.

Legendary beast locale handling annotated and relabeled.

Added a new constant NUM_ENGINE_FLAGS for use in the EngineFlagAction function.  This will make it easier for modders to add or remove engine flags.

home/math.asm

@@ -1,3 +1,14 @@
+AddNTimes:: ; 0x30fe
+; Add bc * a to hl.
+	and a
+	ret z
+.loop
+	add hl, bc
+	dec a
+	jr nz, .loop
+	ret
+; 0x3105
+
 SimpleMultiply:: ; 3105
 ; Return a * c.
 	and a