Magic UV: Release v5.0

* Add features
  - Align UV Cursor
  - UV Cursor Location
  - Align UV
  - Smooth UV
  - UV Inspection
  - Select UV
  - Texture Wrap
  - UV Sculpt
* Improve features
  - Copy/Paste UV: Add menu to UV/Image Editor
  - World Scale UV: Add information about Texel Density
  - UV Bounding Box: Add option "Bound"
  - Texture Projection: Add option "Assign UVMap"
  - UVW: Add option "Assign UVMap"
* Improve UI
* Fixed bugs
* Optimization/Refactoring