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* Refactor the code for all GeomTrimmedCurve and non-periodic BSplines in a single block, adding
support for arcs of hyperbola, parabola and B-Splines.
* Refactor the code for periodic curves (circle, ellipse) in a single block, adding support for
periodic B-Splines.
* Add support for trimming limited by external geometry
* Trim deletes a geometry if intersections are detected and nothing would be left after trimming
* Trim deletes a geometry if no intersection are detected
Bonus:
* Function addConstraint moving the constraint instead of cloning it again
* SketchObject::seekTrimPoints as a wrapper of Part2DObject::seekTrimPoints providing
a correct handling of GeoId indices.
* Helper functions addConstraint/createconstraint to create new constraints and move them
into the Constraint property
* New getGeometry with templated return type defaulting to Part::Geometry.
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New Coin Marker layer intended to temporarely highlight sections of the 3D View for information purposes.
Independent from the actual redrawing of the geometry and constraints.
====================================================
This function takes parameters named GeoId, which evoke the Sketcher GeoId and which
indeed are used by the sketcher. However, these indices are just indices of the provided
geometry list. Therefore:
1. The are never negative (no matter if a corresponding Sketcher GeoId is external or not).
2. They do not have reserved indices for axes.
3. Most importantly, not found GeoId1 and GeoId2 are coded as -1, which for the Sketcher has
a well defined meaning (axis), whereas the Sketcher uses Constraint::GeoUndef as undefined or
not present/ not found index, which currently is -2000.
For these reasons, it was judged appropriate to rename the parameters and documentation to
emphasise that this function is unrelated and dettached from any Sketcher knowledge, and that
indices are just normal indices of a vector.
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On creation of a constraint from the UI (toolbar/menu):
1. if a PointOnObject constraint preexisted the addition of an
edge-to-edge tangency, substitute it with a point-to-edge tangency.
2. if an edge-to-edge tangency preexisted, addition of a PointOnObject
results in a substitution of the edge-to-edge tangency with an edge-to-curve
tangency.
Bonus:
- Refactor of this with preexisting coincident+tangent substitution.
- Activate both substitutions in continuous constraint addition mode.
