Refactor the Unown wall word data (#1131)

constants/charmap.asm

@@ -418,6 +418,16 @@
 	charmap "８", $fe
 	charmap "９", $ff
 
+; Unown charmap, for Unown words (see gfx/tilesets/ruins_of_alph.png)
+pushc
+	newcharmap unown
+	DEF PRINTABLE_UNOWN EQUS "ABCDEFGHIJKLMNOPQRSTUVWXYZ-"
+	for i, STRLEN("{PRINTABLE_UNOWN}")
+		charmap STRSUB("{PRINTABLE_UNOWN}", i + 1, 1), $10 * (i / 8) + 2 * i
+	endr
+	charmap "@", $ff ; end
+popc
+
 ; ASCII charmap, for mobile functions
 pushc
 	newcharmap ascii

constants/script_constants.asm

@@ -320,6 +320,8 @@ DEF NUM_UNOWN_PUZZLES EQU const_value
 	const UNOWNWORDS_LIGHT  ; 1
 	const UNOWNWORDS_WATER  ; 2
 	const UNOWNWORDS_HO_OH  ; 3
+DEF NUM_UNOWN_WALLS EQU const_value
+DEF UNOWN_WALL_MENU_HEADER_SIZE EQU 5
 
 ; MoveTutor setval arguments
 	const_def 1