Keep color overrides in IFC-export

[nokbjo]

When exporting model to IFC the color overrides from the specific view are lost.

The work around to change material on all objects to get the preferred visualization is time consuming and often leads to other problems.

Ex.

Color concrete walls with the same material by there thickness would lead to making multiple material (Concrete t=200mm, concrete t=250mm etc) 

Suggestion:

Add a option on ifc-export to use color overrides

[nokbjo]

Colors is a great way to visualize important properties. And in many situations it is more important to highlight and distinguish on other properties than materials. 

[nokbjo]

Similar idea by @S.Jebakumar 

https://forums.autodesk.com/t5/revit-ideas/colour-overrides-to-be-exported-to-nwc-and-ifc/idi-p/6591...