1.0.0-BETA-2

I have marked this as a pre-release, but it should be pretty stable.

Changes from 1.0.0-BETA-1 (the version I posted in discord)

GitHub Changes:

• Added README, LICENSE, Issue Templates, and set up GitHub Actions
• There's a wiki now!

Plugin Changes:

• Added type for SlotType (fixes issue with gui-slot-type)
• Fixed several issues with GUI Properties throwing errors and not working properly
• Items that are supposed to be stealable can now actually be taken
• Removed some unused methods
• Updated Skript documentation and javadoc