UI Gimbal lock calculator

[Lauloque]

[Lauloque]

see Morgan Loomis' ml_convertRotationOrder.py

(raw)

[Lauloque]

Postponed to future version ; since it isn't required for a first functional version of the addon and will be quite long to do:

I still have to study how ML's tool do the calculations, then find a way to make it in Blender's API. And then it will most likely require to change the current main ui to make it work in a more efficient way with the calculator.