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Uniform testing of Sketch::build() results

Add fstream

Revamp of constraint handling. This was done to remove naked new/delete of Vertex's and Curve clones

Work required before changing Mesh::Edges from type std::vector<Edge*> to std::Vector<Edge>

This is initial work on changing Mesh::Edges from type std::vector<Edge*> to std::vector<Edge>

Most methods in Edge and Mesh were altered.
Methods in Edge which required access to Mesh.Points were moved into Mesh

Added Mesh::delete_me to cleanup memory. Code needs to be refactored to remove naked new and delete during mesh refinement. I.e. move to pointer free management of nodes and edges. This will also improve cache coherency.

The new implementation could be improved by removing calculations that get repeated when changing triangles and further optimizing return paths.

A bug in Mesh::locate_triangle emerged during the insert_internal_contours stage of initial mesh refinement for Stator0 use case. This is related to the locate_triangle method supplying incorrect return values for either nonconvex domains, boundary points, or both, when starting the search from particular edges. The implementation of locate_triangle needs to be reconsidered. Perhaps a bounding box needs to be stored along with the mesh of the actual domain.

Add .oesk extension for sketch output files
Add .oeme extension for mesh output files
Add build_gallery.py python script. Parses ./build/test/output directory for .oesk and .oeme files and saves images using matplotlib

Separate mesh/utility functions into own util.h/util.cpp files

Split Pattern.h/Pattern.cpp into multiple h/cpp files
Translate tests for LineSegment/CircularArc method "split()"

Rename include guards
Reformat files