Ability to graphically visualize `diff`ed BIM/IFC projects to see what has changed

[luzpaz]

The possibility to graphically show areas of a project that have been changed in different iterations. I plan to post follow-up graphics when I find them.

[yorikvanhavre]

There "kind of is" already:

https://yorik.uncreated.net/blog/2019-009
https://github.com/yorikvanhavre/BIM_Workbench/blob/master/BimDiff.py

I'll leave this open because it would do good to do a new batch of testing, long time I didn't use this tool :)

I say "kind of" because it does a brute-force shape comparison and doesn't consider finer changes in IFC objects. A much better approach, probably, would be to make IFC files more reliable, that's basically the NativeIFC idea: https://github.com/brunopostle/ifcmerge/blob/main/docs/whitepaper.rst

[luzpaz]

CC @brunopostle (just giving a heads-up)