Backend: Add event inheritance

[ThatGravyBoat]

What

Adds back event class inheritance as previously not included in #2008 This will create an event handler on the first post of an event and will include all listeners from all super classes.

The changes can be viewed in this commit https://github.com/hannibal002/SkyHanni/commit/c41bc1bf5db7bbc26786ae5eb1b1183c6e85717f This PR also contains moving WorldClickEvent to SkyHanniEvent to demonstrate this.

Changelog Technical Details

• Add SkyHanni event inheritance. - ThatGravyBoat