Enable deepcopy of PythonOCC

[paddy-r]

Need to modify three scripts in PythonOCC to allow deepcopy of them: Quantity_Color, TDF_Label and TopLoc_Location.

Mentioned in this issue at PythonOCC, but never addressed: tpaviot/pythonocc-core#1097

[paddy-r]

Currently done manually by copy and paste, which is not elegant. Need to:

• Write script to automatically check classes in PythonOCC and modify if necessary
• Incorporate this into environment setup/installation No, keep separate.

Refer to Vivarium fix script in #109 commits. Not relevant, monkey-patch instead of modifying library.

[paddy-r]

Reopen to allow fix to repr issue related to deepcopy; closed #16 to avoid duplication.

Update 15/03/23, getting TypeError: cannot pickle 'SwigPyObject' object when trying to duplicate assemblies, suggesting issue still present...

Leaving this issue as is (as want to fix by runtime patch eventually) and podding off into another to fix by manually hacking library, as before (not the best solution!) -> #22.