Single config

See merge request !70

- Moved all config classes to package "org.vadere.util.config".
- Renamed:
  * "ExperimentalResources" to "VadereConfig".
  * "ConfigurationSection" to "IConfigSection".
  * "INIConfigurationSection" to "IniConfigSection".
- Revised "config.ini" (renamed keys and deleted unnecessary keys).

Dev/meshing

See merge request !73

implement property management for AMesh (i.e. array-based). Default value indicating null values not jet implemented.

implement property management for AMesh (i.e. array-based). Default value indicating null values not jet implemented.

Dev/granular post vis

See merge request !72

improved video and picture making for the PostVis and change the PostVis from time step granularity to simulation time granularity.

Resolve "New dependency data science library for Vadere"

Closes #247

See merge request !69

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

refactoring: remove generic but fixed data types from mesh element and introduce the property concept.

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).