Fixed Text on Angle-GO and creating the Text on both sides. Fixed Transparency-Problem by making Text only visible from the front (by 'Pass {Cull Front...}' in TextMeshPro-Shader)

Adjusted the AngleMode from 2 Lines to 3 Points AND Adjusted the AnglePreview for it, because we now can't assume to have Lines between the points

Now really Fixed the problem. Problem was: Vector3.angle() not only returns only values < 180° but also only absolute angle-values

Fixed the Orientation-Problem of the AngleGO. Problem was: Vector3.Angle() returns only an Angle <= 180°