Hide vector of pointers and related methods from the SWIG Python API

Ammar Nejatirequested to merge
a.cleanUpSWIG_nodeChildren into main

The methods which produce a std::vector<const INode*>, std::vector<const Layer*> and std::vector<const IReParticle*> are hidden from the SWIG-produced Python API.

These methods are not needed for the Python interface.

Related to #127 (closed)

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