Revamp of the library with state support

[kelindar]

This PR introduces major breaking changes to the library, primarily focusing on adding state support for each tile. Now, each tile can have an optional state container, represented under the hood as a set (map[T]). To enable this, tile value has become a simple uint32 while the Tile returned by the library is now a cursor pointing to the tile itself, with useful state management methods such as Add(), Del() or Range().