Organize the engine/ directory, director's cut

Cleaned up `engine/routines`, in favor of moving files into more
appropriate directories. predef-related routines are now in top-level
`engine`.
`rtc/delete_save_change_clock.asm` has been split into both
`menus/delete_save.asm` and `rtc/reset_password.asm`.

Made a new subdirectory:
* engine/math: Contains all generic math-related routines.

1 files changed, 29 insertions, 0 deletions

diff --git a/engine/predef.asm b/engine/predef.asm
new file mode 100644
index 000000000..13c593c90
--- /dev/null
+++ b/engine/predef.asm
@@ -0,0 +1,29 @@
+GetPredefPointer:: ; 854b
+; Return the bank and address of wPredefID in a and wPredefAddress.
+
+; Save hl for later (back in Predef)
+	ld a, h
+	ld [wPredefTemp], a
+	ld a, l
+	ld [wPredefTemp + 1], a
+
+	push de
+	ld a, [wPredefID]
+	ld e, a
+	ld d, 0
+	ld hl, PredefPointers
+	add hl, de
+	add hl, de
+	add hl, de
+	pop de
+
+	ld a, [hli]
+	ld [wPredefAddress + 1], a
+	ld a, [hli]
+	ld [wPredefAddress], a
+	ld a, [hl]
+
+	ret
+; 856b
+
+INCLUDE "data/predef_pointers.asm"