Sort By Size Rollup

This contains two simple algorithms that you can use to organize UV shells in a single row, by their area or by their fill size value.

The fill size value sorts all uv shells is a songle row or column by their boundary size and (uv area / boundary area) ratio. This way you can get an idea how the UV packer sorts the uv shells and in what order it place the uv shells into the uv space.

Currently the simple area based sorting is missing from the BETA build yet, but will be the part of UVReactor later.