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/tempmon.asm

@@ -0,0 +1,127 @@
+CopyMonToTempMon: ; 5084a
+; gets the BaseData of a mon
+; and copies the party_struct to wTempMon
+
+	ld a, [wCurPartyMon]
+	ld e, a
+	call GetMonSpecies
+	ld a, [wCurPartySpecies]
+	ld [wCurSpecies], a
+	call GetBaseData
+
+	ld a, [wMonType]
+	ld hl, wPartyMon1Species
+	ld bc, PARTYMON_STRUCT_LENGTH
+	and a
+	jr z, .copywholestruct
+	ld hl, wOTPartyMon1Species
+	ld bc, PARTYMON_STRUCT_LENGTH
+	cp OTPARTYMON
+	jr z, .copywholestruct
+	ld bc, BOXMON_STRUCT_LENGTH
+	callfar CopyBoxmonToTempMon
+	jr .done
+
+.copywholestruct
+	ld a, [wCurPartyMon]
+	call AddNTimes
+	ld de, wTempMon
+	ld bc, PARTYMON_STRUCT_LENGTH
+	call CopyBytes
+
+.done
+	ret
+
+CalcBufferMonStats: ; 5088b
+	ld bc, wBufferMon
+	jr _TempMonStatsCalculation
+
+CalcTempmonStats: ; 50890
+	ld bc, wTempMon
+_TempMonStatsCalculation: ; 50893
+	ld hl, MON_LEVEL
+	add hl, bc
+	ld a, [hl]
+	ld [wCurPartyLevel], a
+	ld hl, MON_MAXHP
+	add hl, bc
+	ld d, h
+	ld e, l
+	ld hl, MON_STAT_EXP - 1
+	add hl, bc
+	push bc
+	ld b, TRUE
+	predef CalcMonStats
+	pop bc
+	ld hl, MON_HP
+	add hl, bc
+	ld d, h
+	ld e, l
+	ld a, [wCurPartySpecies]
+	cp EGG
+	jr nz, .not_egg
+	xor a
+	ld [de], a
+	inc de
+	ld [de], a
+	jr .zero_status
+
+.not_egg
+	push bc
+	ld hl, MON_MAXHP
+	add hl, bc
+	ld bc, 2
+	call CopyBytes
+	pop bc
+
+.zero_status
+	ld hl, MON_STATUS
+	add hl, bc
+	xor a
+	ld [hli], a
+	ld [hl], a
+	ret
+
+GetMonSpecies: ; 508d5
+; [wMonType] has the type of the mon
+; e = Nr. of mon (i.e. [wCurPartyMon])
+
+	ld a, [wMonType]
+	and a ; PARTYMON
+	jr z, .partymon
+	cp OTPARTYMON
+	jr z, .otpartymon
+	cp BOXMON
+	jr z, .boxmon
+	cp TEMPMON
+	jr z, .breedmon
+	; WILDMON
+
+.partymon
+	ld hl, wPartySpecies
+	jr .done
+
+.otpartymon
+	ld hl, wOTPartySpecies
+	jr .done
+
+.boxmon
+	ld a, BANK(sBoxSpecies)
+	call GetSRAMBank
+	ld hl, sBoxSpecies
+	call .done
+	call CloseSRAM
+	ret
+
+.breedmon
+	ld a, [wBreedMon1Species]
+	jr .done2
+
+.done
+	ld d, 0
+	add hl, de
+	ld a, [hl]
+
+.done2
+	ld [wCurPartySpecies], a
+	ret