Make texture unique 2.0

[Aerilius]

This is not for a new feature, but rather to complete and improve an existing feature. When a texture is made unique, Sketchup creates a rectangular image that includes the surroundings of the face. This texture image has much white space because it is oriented according to the model axes.
I think it could be improved by using the technique of Fredo6' FredoScale plugin. It finds the best fitting rectangular for any face.

The current solution is not very efficient: