Add option to the shrinkwrap modifier to update the uvmap

The shrinkwrap modifier distorts uvmap because the mesh is deformed but the uvmap is not updated. Solution: Add checkbox called "[_]UV update" to the modifier and when ticked the shrinkwrap then adjust the uvmap to match the mesh shape. For example if you use shrinkwrap to fill a hole between two objects and then want to uv unwrap that mesh the uvmap is just broken because it uses the uvmap shape of the non-shrinkwrapped mesh. Which in some cases is good but in other cases it is really bad and only way to fix this is to move each vertice by hand and try to visually see if it is right. Applying the shrinkwrap modifier is not a solution in some cases if you have a curve modifier for example (mesh becomes totally distorted).

Basically if you tick t his option on in the modifier and u unwrap the object you get the mesh unwrapped after the it has been shrinkwrapped. If you don't want to use this then leave it off (like it is now).