merge 4248 4251 4278 4292

[Outfit8TSB]

📍 text

Warning

All Addons will now break and to Users who are downloading Spigot, You will have to use Slimefun to make Custom Item and your plugins will not work on spigot anymore! dont blame me! blame ItemStack!

Description

merge #4248 #4251 #4278 #4292 to Slimefun4 GCSD Edition

Proposed changes

• Deprecate Itemstack in favor of SlimefunItemStack(snapshot version)
• check if they work on Snapshot version of NogyangSpigotCraftBukkit

Related Issues (if applicable)

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.