[BUG]

[razorrider7]

** Describe 描述 **
The plugin fails to load with the latest Slimefun and complains about the class me/mrCookieSlime/Slimefun/Objects/SlimefunItem/UnregisterReason not existing. I see #114, but am posting this here because the other issue has no info.

** To Reproduce 如何复现 **
Install Slimefun and ClayTech into the plugins folder
Start the server

** Running Environment 运行环境 **
Tuinity git-Tuinity-"32b4d52" (MC: 1.16.5)
Slimefun DEV - 881 (git dcc5648c)
Metrics-Module #21
Java 11
Installed Addons: (6)
ClayTech v1.2.21
InfinityExpansion vDEV - 103 (git 765f00a7)
ExtraTools vDEV - 26 (git 0cb2ad70)
IllegalStack v2.2.2a
CMI v8.8.2.6
FluffyMachines vDEV - 79 (git 15a0fad9)

** Log 日志 **
https://pastebin.com/5JvVsqwC

[Xzavier0722]

I created a fork and fixed this in here.