getStateCallbacks: return 'undefined' if Room is not using SchemaSeri…

…alizer

bump version to generate dist files with latest @colyseus/schema

fix mistype return of getStateCallbacks()

force getStateCallbacks() to return SchemaCallback<T>

fix 'latest' tag.

introduce .onLeave(code, reason)

use latest @colyseus/schema. bump version

fix resizing buffer on .sendBytes(). bump version.

bump version. use @colyseus/schema 3.0

bump version