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.