Organize the engine/ directory

This is an informed attempt at reorganizing the engine/ directory by
creating categorized subdirectories, in order to make it easier to
navigate and find things.

The directories created are as follows:
* engine/game: Contains all "minigames", things like the unown puzzle
and slot machine.
* engine/gfx: Contains all handling of graphics. From loading palettes
to playing animations.
* engine/link: Contains all multiplayer functionality.
* engine/menu: Contains all generic/misc. menus and menu code.
Other, more specialized menus are in their own subdirectories (pokedex,
pokegear, party menu, etc).
* engine/overworld: Contains all handling of the overworld. From loading
and connecting maps to wild encounters and the scripting engine.
* engine/pokegear: In the same vein as engine/pokedex, except it could
use some more splitting up.
* engine/pokemon: Contains everything related to manipulating pokemon
data. From the pokemon storage system to evolution and mail.
* engine/printer: Contains everything related to printing things as well
as the printer communication.
* engine/title: Contains intro sequences, title screens and credits.

engine/pokemon/learn.asm

@@ -0,0 +1,256 @@
+LearnMove: ; 6508
+	call LoadTileMapToTempTileMap
+	ld a, [wCurPartyMon]
+	ld hl, wPartyMonNicknames
+	call GetNick
+	ld hl, wStringBuffer1
+	ld de, wMonOrItemNameBuffer
+	ld bc, MON_NAME_LENGTH
+	call CopyBytes
+
+.loop
+	ld hl, wPartyMon1Moves
+	ld bc, PARTYMON_STRUCT_LENGTH
+	ld a, [wCurPartyMon]
+	call AddNTimes
+	ld d, h
+	ld e, l
+	ld b, NUM_MOVES
+; Get the first empty move slot.  This routine also serves to
+; determine whether the Pokemon learning the moves already has
+; all four slots occupied, in which case one would need to be
+; deleted.
+.next
+	ld a, [hl]
+	and a
+	jr z, .learn
+	inc hl
+	dec b
+	jr nz, .next
+; If we're here, we enter the routine for forgetting a move
+; to make room for the new move we're trying to learn.
+	push de
+	call ForgetMove
+	pop de
+	jp c, .cancel
+
+	push hl
+	push de
+	ld [wd265], a
+
+	ld b, a
+	ld a, [wBattleMode]
+	and a
+	jr z, .not_disabled
+	ld a, [wDisabledMove]
+	cp b
+	jr nz, .not_disabled
+	xor a
+	ld [wDisabledMove], a
+	ld [wPlayerDisableCount], a
+.not_disabled
+
+	call GetMoveName
+	ld hl, Text_1_2_and_Poof ; 1, 2 and…
+	call PrintText
+	pop de
+	pop hl
+
+.learn
+	ld a, [wPutativeTMHMMove]
+	ld [hl], a
+	ld bc, MON_PP - MON_MOVES
+	add hl, bc
+
+	push hl
+	push de
+	dec a
+	ld hl, Moves + MOVE_PP
+	ld bc, MOVE_LENGTH
+	call AddNTimes
+	ld a, BANK(Moves)
+	call GetFarByte
+	pop de
+	pop hl
+
+	ld [hl], a
+
+	ld a, [wBattleMode]
+	and a
+	jp z, .learned
+
+	ld a, [wCurPartyMon]
+	ld b, a
+	ld a, [wCurBattleMon]
+	cp b
+	jp nz, .learned
+
+	ld a, [wPlayerSubStatus5]
+	bit SUBSTATUS_TRANSFORMED, a
+	jp nz, .learned
+
+	ld h, d
+	ld l, e
+	ld de, wBattleMonMoves
+	ld bc, NUM_MOVES
+	call CopyBytes
+	ld bc, wPartyMon1PP - (wPartyMon1Moves + NUM_MOVES)
+	add hl, bc
+	ld de, wBattleMonPP
+	ld bc, NUM_MOVES
+	call CopyBytes
+	jp .learned
+
+.cancel
+	ld hl, Text_StopLearning ; Stop learning <MOVE>?
+	call PrintText
+	call YesNoBox
+	jp c, .loop
+
+	ld hl, Text_DidNotLearn ; <MON> did not learn <MOVE>.
+	call PrintText
+	ld b, 0
+	ret
+
+.learned
+	ld hl, Text_LearnedMove ; <MON> learned <MOVE>!
+	call PrintText
+	ld b, 1
+	ret
+; 65d3
+
+ForgetMove: ; 65d3
+	push hl
+	ld hl, Text_TryingToLearn
+	call PrintText
+	call YesNoBox
+	pop hl
+	ret c
+	ld bc, -NUM_MOVES
+	add hl, bc
+	push hl
+	ld de, wListMoves_MoveIndicesBuffer
+	ld bc, NUM_MOVES
+	call CopyBytes
+	pop hl
+.loop
+	push hl
+	ld hl, Text_ForgetWhich
+	call PrintText
+	hlcoord 5, 2
+	ld b, NUM_MOVES * 2
+	ld c, MOVE_NAME_LENGTH
+	call TextBox
+	hlcoord 5 + 2, 2 + 2
+	ld a, SCREEN_WIDTH * 2
+	ld [wBuffer1], a
+	predef ListMoves
+	; w2DMenuData
+	ld a, $4
+	ld [w2DMenuCursorInitY], a
+	ld a, $6
+	ld [w2DMenuCursorInitX], a
+	ld a, [wNumMoves]
+	inc a
+	ld [w2DMenuNumRows], a
+	ld a, $1
+	ld [w2DMenuNumCols], a
+	ld [wMenuCursorY], a
+	ld [wMenuCursorX], a
+	ld a, $3
+	ld [wMenuJoypadFilter], a
+	ld a, $20
+	ld [w2DMenuFlags1], a
+	xor a
+	ld [w2DMenuFlags2], a
+	ld a, $20
+	ld [w2DMenuCursorOffsets], a
+	call StaticMenuJoypad
+	push af
+	call Call_LoadTempTileMapToTileMap
+	pop af
+	pop hl
+	bit 1, a
+	jr nz, .cancel
+	push hl
+	ld a, [wMenuCursorY]
+	dec a
+	ld c, a
+	ld b, 0
+	add hl, bc
+	ld a, [hl]
+	push af
+	push bc
+	call IsHMMove
+	pop bc
+	pop de
+	ld a, d
+	jr c, .hmmove
+	pop hl
+	add hl, bc
+	and a
+	ret
+
+.hmmove
+	ld hl, Text_CantForgetHM
+	call PrintText
+	pop hl
+	jr .loop
+
+.cancel
+	scf
+	ret
+; 666b
+
+Text_LearnedMove: ; 666b
+; <MON> learned <MOVE>!
+	text_jump UnknownText_0x1c5660
+	db "@"
+; 6670
+
+Text_ForgetWhich: ; 6670
+; Which move should be forgotten?
+	text_jump UnknownText_0x1c5678
+	db "@"
+; 6675
+
+Text_StopLearning: ; 6675
+; Stop learning <MOVE>?
+	text_jump UnknownText_0x1c5699
+	db "@"
+; 667a
+
+Text_DidNotLearn: ; 667a
+; <MON> did not learn <MOVE>.
+	text_jump UnknownText_0x1c56af
+	db "@"
+; 667f
+
+Text_TryingToLearn: ; 667f
+; <MON> is trying to learn <MOVE>. But <MON> can't learn more than
+; four moves. Delete an older move to make room for <MOVE>?
+	text_jump UnknownText_0x1c56c9
+	db "@"
+; 6684
+
+Text_1_2_and_Poof: ; 6684
+	text_jump UnknownText_0x1c5740 ; 1, 2 and…
+	start_asm
+	push de
+	ld de, SFX_SWITCH_POKEMON
+	call PlaySFX
+	pop de
+	ld hl, .PoofForgot
+	ret
+
+.PoofForgot:
+; Poof! <MON> forgot <MOVE>. And…
+	text_jump UnknownText_0x1c574e
+	db "@"
+; 669a
+
+Text_CantForgetHM: ; 669a
+; HM moves can't be forgotten now.
+	text_jump UnknownText_0x1c5772
+	db "@"
+; 669f