Enable script in big world (#884)

* add docs for tower

* fix: LEAK: ByteBuf.release() was not called

* enableScriptInBigWorld

* not print log when loaded scripts from cache

* revert the change of server tick

* revert the change of server tick

* fix

* optimize the performance: lazy load & cache

* fix the refresh group

* fix NPE

Co-authored-by: Melledy <52122272+Melledy@users.noreply.github.com>