Export lib/ from sim/

This is a dumb hack, but it allows everyone to use PS's lib files
with `require('pokemon-showdown')`.

This is EXTREMELY unsupported and I make ZERO guarantees about API
stability.

sim/index.ts

@@ -18,3 +18,4 @@ export {Pokemon} from './pokemon';
 export {PRNG} from './prng';
 export {Side} from './side';
 export {TeamValidator} from './team-validator';
+export * from '../lib';