`uint` vs `usize`

[waywardmonkeys]

There are to_uint methods for TypedRect, TypedSize2D, TypedPoint2D and TypedPoint3D.

However, these methods generate types that are using usize, not uint. This makes the naming confusing.

There seem to be 4 possible ways forward:

• Leave things as they are now.
• Change the return types and documentation to uint.
• Rename the methods to to_usize.
• Rename these methods to to_usize and then add to_uint methods that actually return uint-based types.

[jdm]

This is a historical name, back from when uint was a type the compiler accepted. It was renamed to usize, but this library's method names were not updated accordingly. Renaming to to_usize makes the most sense to me if we're going to change anything.