Will BL

The path to the `mods` folder is configurable [with a system property](https://github.com/FabricMC/fabric-loader/blob/master/src/main/java/net/fabricmc/loader/impl/util/SystemProperties.java#L47). This is useful for modpack installers, which may wish to decouple the mods folder from the game directory,...

wip... - methods on `ImmutableComponentKey` to get data / modify data without directly using the `ImmutableComponentWrapper` - support for attaching to things other than entities (lol) - support for registering...