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

constants/map_object_constants.asm

@@ -199,6 +199,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const SPRITEMOVEFN_SPIN_COUNTERCLOCKWISE ; 19
 	const SPRITEMOVEFN_BOULDERDUST           ; 1a
 	const SPRITEMOVEFN_GRASS                 ; 1b
+NUM_SPRITEMOVEFN EQU const_value
 
 ; StepTypesJumptable indexes (see engine/overworld/map_objects.asm)
 	const_def
@@ -228,6 +229,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const STEP_TYPE_17               ; 17
 	const STEP_TYPE_DELETE           ; 18
 	const STEP_TYPE_SKYFALL_TOP      ; 19
+NUM_STEP_TYPES EQU const_value
 
 ; ObjectActionPairPointers indexes (see engine/overworld/map_object_action.asm)
 	const_def
@@ -248,6 +250,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const OBJECT_ACTION_BOULDER_DUST  ; 0e
 	const OBJECT_ACTION_GRASS_SHAKE   ; 0f
 	const OBJECT_ACTION_SKYFALL       ; 10
+NUM_OBJECT_ACTIONS EQU const_value
 
 ; Facings indexes (see data/sprites/facings.asm)
 	const_def
@@ -283,6 +286,7 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const FACING_BOULDER_DUST_2 ; 1d
 	const FACING_GRASS_1        ; 1e
 	const FACING_GRASS_2        ; 1f
+NUM_FACINGS EQU const_value
 
 ; DoPlayerMovement.DoStep arguments (see engine/overworld/player_movement.asm)
 	const_def
@@ -294,3 +298,4 @@ NUM_SPRITEMOVEDATA EQU const_value
 	const STEP_TURN          ; 5
 	const STEP_BACK_LEDGE    ; 6
 	const STEP_WALK_IN_PLACE ; 7
+NUM_STEPS EQU const_value