Fix snake_case filenames

Renamed a bunch of files, most of them one-off functions, to better fit
the general snake_case naming scheme. Also renamed some awfully long filenames.

engine/rtc/print_hours_mins.asm

@@ -0,0 +1,63 @@
+Unreferenced_Function1dd6a9: ; 1dd6a9
+	ld a, b
+	ld b, c
+	ld c, a
+	push bc
+	push de
+	ld hl, sp+$2
+	ld d, h
+	ld e, l
+	pop hl
+	lb bc, PRINTNUM_LEADINGZEROS | 2, 5
+	call PrintNum
+	pop bc
+	ret
+
+PrintHoursMins: ; 1dd6bb (77:56bb)
+; Hours in b, minutes in c
+	ld a, b
+	cp 12
+	push af
+	jr c, .AM
+	jr z, .PM
+	sub 12
+	jr .PM
+.AM:
+	or a
+	jr nz, .PM
+	ld a, 12
+.PM:
+	ld b, a
+; Crazy stuff happening with the stack
+	push bc
+	ld hl, sp+$1
+	push de
+	push hl
+	pop de
+	pop hl
+	ld [hl], " "
+	lb bc, 1, 2
+	call PrintNum
+	ld [hl], ":"
+	inc hl
+	ld d, h
+	ld e, l
+	ld hl, sp+$0
+	push de
+	push hl
+	pop de
+	pop hl
+	lb bc, PRINTNUM_LEADINGZEROS | 1, 2
+	call PrintNum
+	pop bc
+	ld de, String_AM
+	pop af
+	jr c, .place_am_pm
+	ld de, String_PM
+.place_am_pm
+	inc hl
+	call PlaceString
+	ret
+
+String_AM: db "AM@" ; 1dd6fc
+String_PM: db "PM@" ; 1dd6ff