- added PedestrianOverlapProcessor, MAxOverlapProcessor and NumberOverlapProcessor to all scenarios
- increased size of sources in cases where overlaps occurred in the source

Minor changes to Overlap Processors so that they also work if no overlap happens during the simulation.

The stairs consist of multiple paths. Each tread is one path. The black
'line' is not a path but an empty space filled by a black background
behind the stairs.

Changes for v0.6:

Processors:
* remove PedestrianOverlapDistProcessor and add functionality in
  PedestrianOverlapProcessor.
* show overlap distance in PedestrianOverlapProcessor as a positive
  delta
* refactor NumberOverlapsProcessor to use PedestrianOverlapProcessor
  as dependency
* refactor MaxOverlapProcessor to use PedestrianOverlapProcessor
  as dependency

JsonTransform Tests:

To test transformation and manipulate Jackson's JsonNode representation
four new Interface are included.

* JsonNodeExplorer: Methods to travers, delete and add JsonNodes in an
  existing Json representation. Many methods will throw Exceptions if
  a path does not exist or the operation does not work. Included are
  helpers for eays path traversal (i.e. path(root, "path/to/node"))

* TestJsonNodeExplorer: This extends the JsonNodeExplorer and overwrites
  all Methods with exceptions and insted inclueds Assertions and
  Junit test to indicate an error. Thus for example the method
  pathMustExist contains an assertion test that the path exists. This
  can be used in UnitTest as assertions.

* TestJsonNodeHelper: Create JsonNode tree from text files

* TestResourceHandler: Allows to load file based resources for test
  and will create backups of test files so the test enviroment can be
  resotred if a test fails. This helps in the development process.

TimestepPedestrianIdOverlap -> TimestepPedestrianIdOverlapKey
pedestrianMaxOverlapProcessorId -> pedestrianOverlapDistProcessorId

update basic_1_chicken_gnm1.scenario: reduce the number of spawn pedestrians such that they fit on the source area.

Add a distance field which is computed by a brute force method i.e. computing the distance to all obstacles taking the minimum value. This is now the new default method to be used.

In "run_vadere_console_with_all_scenario_files.py", marked three additional scenarios as long-running tasks.

The three scenarios are:
- basic_4_1_wall_gnm1
- thin_wall_and_closer_source_nelder_mead_ok
- thin_wall_and_closer_source_pso_could_fail

# Conflicts:
#	VadereModelTests/TestOSM/scenarios/rimea_09_public_room_2_exits_PSO.scenario

In "TestOSM/scenarios/thin_wall_pso_ok.scenario", assigned correct id to "pedestrianWaitingTimeProcessorId" to avoid "NullPointerException".

In "run_vadere_console_with_all_scenario_files.py", set timeout of long-running scenarios to 480 seconds and added "TestSFM" to long-running scenarios.

With this change the user does not need to hit enter to see the new
file name on the left hand side of the ProcessorView. With focus
loss the filename is validated and reverted to a default name if
invalid.