Incompatible with newer versions of github.com/kelindar/tile due to generics

[blevz]

kelindar/[email protected]/world/world.go:24:11: cannot use generic type tile.Grid[T comparable] without instantiation

I think World needs to be made generic and have the type passed thru. Can put out a pr if you'd like

[blevz]

https://github.com/kelindar/ecs/pull/4

This fixes the above issue for me