In "AdjustPanel" of PostVis: The "time" spinner uses the time resolution of the "time resolution" spinner now

Also renamed the (slightly) bulky term "simTimeStepLength" to simple "timeResolution".
This affects mostly these files:
- VadereGui/.../messages.properties
- VadereGui/.../PostvisualizationConfig.java
- VadereGui/.../PostvisualizationModel.java
- VadereUtils/.../VadereConfig.java
  Here, I renamed the key "PostVis.visTimeStepLength" to "PostVis.timeResolution"
  and use our default simulation step length (of 0.4 seconds) as default value
  instead of 0.1 seconds.

Test client stsc

See merge request !92

"NullPointerException" occurred when loading Michael's scenario files:
Forschung/Simulationen/BHM_paper_scenarios_von_ms/

VadereSimulator/src/org/vadere/simulator/projects/io/IOVadere.java:
- Made error message more precise by providing name of scenario and filename.

update reference scenarios for TestNelderMead (there are no model changes, but the random number order changed)

* IReachablePointProvider to get points to place pedestrians (overlap with other pedestrians must be checked)
* GUI to add random pedestrians
* TreeView showing all ScenarioElements in the TopographyCreator.

TraCI and Cache handling update

See merge request !91

If the getTargetId TraCI-Command is executed with the targetId "-1" (invalid for any agent) then the command returns a list of all targetIds currently in the simulation.

This reverts commit 35976b6f.

# Conflicts:
#	Scenarios/ModelTests/TestPsychology/CognitionAndBehavior/scenarios/12-CounterFlow-SBEnabled.scenario

Removed "VShape.copy()", renamed "AttributesAgentPsychology" to "PsychologyStatus" and updated migration ""