Multiple Location types can cause confusion

[Brandhoej]

Motivated by Issue #71 it might be desirable to have a single class of Location and use that to cover all types. This removes type confusion, removes explicit type conversion which can cause runtime errors, and it ultimately allows us to later be more better at handling memory allocation by using an Object pool.

In another experimental branch I have found a way to merge all Location classes into a single Location class. As of now, it requires some clean up, but might be a great starting point for discussion.

[Brandhoej]

Closed by #74