Speckle_Toolkit: implement the Replace() if doable

[alelom]

Conditions: #2 is done; #10, #11 and #15 are doable/done

The previous would open up the possibility of using tags (the whole procedure of the Replace() method).
We could Push (upload) only portions of the model via the tags.
The procedure would be:

• Ask Speckle to clone the stream (Speckle_Toolkit: see how to ask Speckle to clone the stream #15)
• Targeting the cloned stream, delete specific objects from it (Speckle_Toolkit: implement the Delete() if doable #11)
• Create (upload) only the specific objects being updated