Harbor 1.6.4 Beta 1

This beta of Harbor fixes a few smaller bugs, most of them related to the instant skip setting. I've previously overlooked this setting in both development and testing because I personally don't use it on my server, but this update should fix all reported issues with the setting. Additionally, I've done a few smaller code base cleanups to make sure Harbor is easily maintainable and runs smooth as ever.

Fixed issues in this build:
Thunderstorm loop not clearing rain when using instant skip: #72
Weather clearing not working when using instant skip (reported on Discord)

As always, make sure to open an issue if you have any issues with this beta- please make sure to specify that you're using a beta!