misc: just PointerGadeget snaps on tree-roof, used 'IsApproximatelyParallel' for RayFact Equivalency

+added Lot&Pendulum-Tool +Using Math3d lib for VectorCalculus +Changed Fact managment (unstable\!) +Misc refactoring

Fixed json-payload for OnLineFacts and LineFacts + Adjustments so that SupplementaryAngles-Scroll works again + Adjusted GET on Scroll/List-endpoint in DisplayScrolls so that it tries several times, because server mostly returns a 500 on first try