Add constants and table macros for the map sprite sets

[Rangi42]

The individual sprite sets use table macros to verify that they each have 11 sprites (9 walking and 2 still), but their IDs are still raw hex numbers.

• $01: Pallet Town, Viridian City, Cinnabar Island, Route 1, Route 2 (south), Route 20 (east), Route 21, Route 22
• $02: Pewter City, Cerulean City, Route 2 (north), Route 3, Route 4, Route 5 (north), Route 9, Route 10 (north), Route 24, Route 25
• $03: Lavender Town, Route 8 (west), Route 10 (south), Route 12 (north)
• $04: Vermilion City, Route 6 (south), Route 11 (east)
• $05: Celadon City, Route 7 (east), Route 16 (west)
• $06: Indigo Plateau, Route 23
• $07: Saffron City, Route 5 (south), Route 6 (north), Route 7 (west), Route 8 (east)
• $08: [Silence Bridge] Route 11 (west), Route 12 (south), Route 13, Route 14, Route 15 (west)
• $09: [Cycling Road] Route 16 (east), Route 17, Route 18 (east)
• $0A: Fuchsia City, Route 15 (east), Route 18 (west), Route 19, Route 20 (west)