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add stand alone features from VadereManagement module:

See merge request !71

* single step mode in GUI:
  Allows the user to step through the simulation one step at a time to
  identify bugs.
* simplify obstacles:
  Merge multiple obstacles based on the convex hull their points create.
  The merge can be undon
* add features to open street map (osm) importer:
  1) import 'open' paths as polygons with a specified width. With this
     it is possible to create walls or subway entrance
  2) add option to include osm ids into each obstacle

fix issue #242.

Closes #242

See merge request !66

add modified T-junction scenario calibrated via evacuation times which we used for the tgf2019 vadere paper, remove T-junction experiment data (they can be found on our nextcloud).

VadereGui/src/org/vadere/gui/projectview/view/ProjectView.java:
- Also removed unnecessary shortcut "Ctrl + A" to open "ActionShowAboutDialog".
  "Ctrl + A" should be used in the future to select **all** scenario elements in the topography creator.

update TrajectoryMetric-notebook: computation of the velocity, densities and the fundamental diagram. Cutting of trajectories.

Adapted three scenario files for salient behavior (use random seed and spawnAtRandomPositions=true).

Salient behavior

See merge request !68

Used following commands:
- mvn -Dmaven.test.skip=true package
- java -jar VadereSimulator/target/vadere-console.jar migrate -r VadereModelTests/
- git clean -n
- git clean -f (to delete <scenario_file>.scenario.legacy which is created by migration assistant)