Verify data table sizes with table_width and assert_table_length macros

This was discussed in #706

It also uncovered some off-by-one issues with defining some constants.

A few structs now use rsreset/_RS to define their offset constants, as discussed in #739

engine/gfx/color.asm

@@ -1305,7 +1305,9 @@ MapObjectPals::
 INCLUDE "gfx/overworld/npc_sprites.pal"
 
 RoofPals:
+	table_width PAL_COLOR_SIZE * 2 * 2, RoofPals
 INCLUDE "gfx/tilesets/roofs.pal"
+	assert_table_length NUM_MAP_GROUPS + 1
 
 DiplomaPalettes:
 INCLUDE "gfx/diploma/diploma.pal"

engine/gfx/load_pics.asm

@@ -311,7 +311,7 @@ GetTrainerPic:
 	ld a, [wTrainerClass]
 	and a
 	ret z
-	cp NUM_TRAINER_CLASSES
+	cp NUM_TRAINER_CLASSES + 1
 	ret nc
 	call WaitBGMap
 	xor a

engine/gfx/sprite_anims.asm

@@ -12,7 +12,8 @@ DoAnimFrame:
 	jp hl
 
 .Jumptable:
-; entries correspond to SPRITE_ANIM_SEQ_* constants
+; entries correspond to SPRITE_ANIM_SEQ_* constants (see constants/sprite_anim_constants.asm)
+	table_width 2, DoAnimFrame.Jumptable
 	dw AnimSeq_Null
 	dw AnimSeq_PartyMon
 	dw AnimSeq_PartyMonSwitch
@@ -48,6 +49,7 @@ DoAnimFrame:
 	dw AnimSeq_IntroUnown
 	dw AnimSeq_IntroUnownF
 	dw AnimSeq_IntroSuicuneAway
+	assert_table_length NUM_SPRITE_ANIM_SEQS
 
 AnimSeq_Null:
 	ret