Rename EV_* constants to EVOLVE_* like pokecrystal

[SatoMew]

I changed the constants to match pokegold and pokecrystal, and updated the remaining instances of the level-based evolution type.

[dannye]

The 1's that you replaced do not represent EV_LEVEL, they are the minimum level requirement for the EV_ITEM evolution that they are a part of.
https://github.com/pret/pokered/blob/master/engine/pokemon/evos_moves.asm#L102

[SatoMew]

oh, my apologies, I misunderstood what they represented.

[Rangi42]

Thanks! This is a good start toward syncing gen 1 and 2 evos/attacks data, but should we leave this PR open to do more? For example, decide on one name (evos_attacks.asm or evos_moves.asm?), and consistent comments (; Evolutions and ; Learnset headers, or ; no more evolutions and ; no more level-up moves trailers?). Ideally a diff of the pokered and pokecrystal files would show the actual changes in game data, not asm formatting differences. If we decide pokered has the better choice sometimes, the gen 2 repos will need updating too.

[SatoMew]

Thanks! This is a good start toward syncing gen 1 and 2 evos/attacks data, but should we leave this PR open to do more?

I'm OK with that! 🙂

[Rangi42]

This is not being maintained, so merging as-is, just for the small pokecrystal sync.