Also changed rendering of Circle prefab to Cylinders

CircleGenerator now generates triangles around midPoint instead of using CreatePlane of ShapeGenerator

Moved setting of collider shared mesh from FactSpawner to TorusGenerator
Also adjusted position of Torus Text

removed Ring from Pointer and FactDeleter IgnoreLayerMasks

added 'Ring' Layer
fixed ring Collider
added snapping to ring in WorldCursor

Added scripts for generating circle-, cone and torus shaped meshes
Added fact visualisation for CircleFact as torus
Moved CircleSegmentGenerator under MeshGenerator

+Doygen for most of Assets/Scripts/InteractionEngine/FactHandling/* and Gadget.cs +Bug fixes for saving/loading fuctionalities of Stages