Enhance: add a pictogram in the model tree for features with external references

[mwa]

Features which have external references can now only be seen by the reference manager. Enhancement for this is needed:

- Make it directly clear that a feature has an external reference by changing the pictogram in the model tree (similar to Inventor)

- For all features: the external reference shall be removed via a right click option on the feature in the model tree (similar to Inventor)

- add a config option that if you take over a reference from another part (for example a hole, edge, datum plane, surface etc.), that it will be copied by default instead of making an external reference.

By doing so, it will be easier to copy references from other parts and afterwards removing the external reference. Nowadays external references are mostly avoided because of the difficulties to remove them afterwards.

[TomU]

I wonder if this should be broken into separate ideas.  I like the first idea (separate icon) but I don't care for the third (copy references) since it would fundamentally break the parametric relationship between models.  Combining all of them makes it hard to vote...

[olivierlp]

Hello,

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