Feature/isection angle quads

See merge request DennisGlaeser/frackit!33

We can use these overloads for other planar 2d geometries, such as e.g.
quadrilaterals, as well. This commit generalizes the overloads to allow
for such.

Feature/quad cylsurface intersection

See merge request DennisGlaeser/frackit!31

The algorithm that was implemented for disk-cylindersurface
intersections was actually generic enough to be reused for other planar
geometry types, such as e.g. quadrilaterals in 3d space. Therefore, we
have moved the implementation into a generic header.

Feature/disk quad intersection

See merge request DennisGlaeser/frackit!30

Feature/quad quad intersection

See merge request DennisGlaeser/frackit!29

Feature/quad line intersection

See merge request DennisGlaeser/frackit!28

The disk-disk intersection algorithm was actually written in a way that
it works for any planar geometries in 3d space. Therefore, we outsource
the algorithm in a generic header that can be reused also in other
algorithms.

the algorithm we used for disk-line intersections so far is actually,
apart from very minor modifications, generic enough to be used for all
planar and bounded two-dimensional geometries in 3d space. Therefore, we
outsource it to a separate header where it can be reused in other
algorithms.

Feature/quad sampler

See merge request DennisGlaeser/frackit!26