Decompose MultipleImplementation.getOutput
[WIP] MultipleCurves: Alternative approach

Step 1: Discard all nodes with degree > 1
Added TODOs for next steps, to be implemented.
Document exact meaning of Point.getAngle()
Line.getAngleOf(Point) to get the angle of a point relative to a line
Add method Line.originAt(point)

To ease calculations where the "direction" of the line is
significant, e.g. in slope or angle calculations.