Random team generation scripts are no longer in scripts.js, but instead
in a new file random-teams.js.
The scripts are now also no longer run from inside battles, but in a
new team generator object. This makes it easier for external scripts
to generate random teams by running Dex.generateTeam(format).
This is a surprisingly minor refactor considering how many files it
touches, but most of this is only renames.
In terms of file renames:
- `tools.js` is now `sim/dex.js`
- `battle-engine.js` is now `sim/index.js` and its three classes are
in `sim/battle.js`, `sim/side.js`, and `sim/pokemon.js`
- `prng.js` is now `sim/prng.js`
In terms of variable renames:
- `Tools` is now `Dex`
- `BattleEngine` is now `Sim`
- `BattleEngine.Battle` is now `Sim.Battle`
- `BattleEngine.BattleSide` is now `Sim.Side`
- `BattleEngine.BattlePokemon` is now `Sim.Pokemon`
