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

data/types/names.asm

@@ -1,5 +1,6 @@
 TypeNames:
 ; entries correspond to types (see constants/type_constants.asm)
+	table_width 2, TypeNames
 	dw Normal
 	dw Fighting
 	dw Flying
@@ -10,6 +11,7 @@ TypeNames:
 	dw Bug
 	dw Ghost
 	dw Steel
+	assert_table_length UNUSED_TYPES
 	dw Normal
 	dw Normal
 	dw Normal
@@ -20,6 +22,7 @@ TypeNames:
 	dw Normal
 	dw Normal
 	dw CurseType
+	assert_table_length UNUSED_TYPES_END
 	dw Fire
 	dw Water
 	dw Grass
@@ -28,6 +31,7 @@ TypeNames:
 	dw Ice
 	dw Dragon
 	dw Dark
+	assert_table_length TYPES_END
 
 Normal:    db "NORMAL@"
 Fighting:  db "FIGHTING@"

data/types/search_strings.asm

@@ -1,5 +1,6 @@
 PokedexTypeSearchStrings:
 ; entries correspond with PokedexTypeSearchConversionTable (see data/types/search_types.asm)
+	table_width POKEDEX_TYPE_STRING_LENGTH, PokedexTypeSearchStrings
 	db "  ----  @"
 	db " NORMAL @"
 	db "  FIRE  @"
@@ -18,3 +19,4 @@ PokedexTypeSearchStrings:
 	db " DRAGON @"
 	db "  DARK  @"
 	db " STEEL  @"
+	assert_table_length NUM_TYPES + 1

data/types/search_types.asm

@@ -1,5 +1,6 @@
 PokedexTypeSearchConversionTable:
 ; entries correspond with PokedexTypeSearchStrings (see data/types/search_strings.asm)
+	table_width 1, PokedexTypeSearchConversionTable
 	db NORMAL
 	db FIRE
 	db WATER
@@ -17,3 +18,4 @@ PokedexTypeSearchConversionTable:
 	db DRAGON
 	db DARK
 	db STEEL
+	assert_table_length NUM_TYPES