tritao ea80310642 Gui: Provide ViewProviderFeaturePython selection callbacks ...

Adds support for Python-based selection callbacks to
`ViewProviderFeaturePython` objects.

It follows the same conventions as `SelectionObserverPython`, follows an
example:

```python
    def setPreselection(self, document, object, element):
        print("setPreselection: %s.%s.%s"%(document, object, element))

    def removePreselection(self, document, object, element):
print("removePreselection: %s.%s.%s"%(document, object,
element))

    def addSelection(self, document, object, element, position):
print("addSelection: %s.%s.%s at %s"%(document, object, element,
str(position)))

    def removeSelection(self,document, object, element):
        print("removeSelection: %s.%s.%s"%(document, object, element))

    def setSelection(self,doc):
        sel = FreeCADGui.Selection.getSelection(doc)
        print("setSelection: %s"%sel)

    def clearSelection(self,doc):
        print("clearSelection\n")
```

2025-02-24 15:02:38 +00:00

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