[W.I.P.] Curve Tools plugin

[micheus]

tkbd, thanks for keep testing it .

New update is available:

Code:

- Fixed some bad orientation of TNB vectors for Linear curve style;
- Workaround to fix possible garbage on selection left by and undo/redo action;
- Fixed the compute of the first handle for a Bèzier curve. It was causing
  error when creating a curve from converting edges to curve;

Download link (you can replace the .beams file or use the File->Install Plug-in or Patch option)