Live mesh analysis improvements

[thomthom]

From Tobias Kern:

I don’t like the permanent colorization of my geomtery with the QFT.
The „permanent“ is my problem.

Is it possible to develop:

• A temporary colorization as addition to QFT,
  after closing the tool, the geometry got their original color back,
  so you can only visual check.

  Like:
  Start Tool (geometry gets temporary colorized)
  stay es long as you like in the tool
  End Tool (via „esc")

• A recolor tool, if the color has permanent changed, you can restore the original color.