improved inflating of models: each face influence is now weighted with the opening angle of the triangle-corner

multithreaded workspace creation v1

See merge request !15

Mesh inflating

See merge request !14

# Conflicts:
#   VirtualRobot/Visualization/CoinVisualization/CoinVisualizationFactory.h
#   VirtualRobot/Visualization/TriMeshModel.cpp
#   VirtualRobot/Visualization/TriMeshModel.h

collision model stores now the original visu to be able to inflate it multiple times with different margins

sanity checks in math tools