Merge branch 'nr/monitoring-clemens' into 'master'

Merge nr/monitoring clemens into master

- added possibility to "destroy" cells in 5GTopologyDatabase and 5GVis using SHIFT + Left-Click - default FALSE
- added default black circle for drawing of nodes
- added differentiation for Mouse-Click, -Drag, -Release etc.
- deleted timoutcollections as they seem to be unused and are in overlays with initial behavior of Leo Nobach and extended by Nils Richerzhagen and Clemens Krug. Will be merged next.

See merge request !42