This only affects scenarios which do not us group models. Due to
refactoring of the group model the group size distribution is
set by source. This allows different source to spawn different group
sizes.

In "run_vadere_console_with_all_scenario_files.py", print runtime (in seconds) for each scenario file.

Moved CI helper scripts to "Tools/ContinuousIntegration" and enabled Java assertions in POM files and helper scripts.

.gitlab-ci.yml:
- Refactored complete file: moved comment on top of file.
- Call helper scripts in "Tools/ContinuousIntegration" instead of just "Tools".

Tools/ContinuousIntegration/run_vadere_console_with_all_scenario_files.py:
- Execute scenario files alphabetically.
- Use "-enableassertions" when invoking Java.

POM files:
- Use "<enableAssertions>true</enableAssertions>" to be independent of SureFire's default settings.

Each JoltTransformation is create as a Singletone from the abstract
JoltTransformation class. These classes manage the transformation and
postHook processing if needed. All resource files were renamend to
automatically build resources names based on the current version alone.

This addition is needed because not all transformation can be done
with the Jolt Transformation. Each implementation of JoltTransformation
has a list of PostTransformHooks which will be executed in order on
the JsonNode representation _after_ the Jolt transformation is done.

This allows context specific transformation. If needed a postHook will
be added in the future.

This reverts commit 7b1da6cf.

The MigrationAssistant know has tow implementation which can be used
interchangeably. The Selection of the the right implementation is
triggerd by a flag within the MigrationOptions Class.

.gitlab-ci.yml:
- Use "mvn <options> <phase>" syntax consequently like mentioned in "mvn --help".

Also refactored code a little bit:
- Now, "generatePathForScenarioElement()" does not close the path with "to cycle;".
  Instead, the caller must close the path by appending "to cycle" or simply ";" (which is required for trajectories).

This is necessary because ode algorithm will loop forever if two
dynamic elements overlap in this way.

In "run_vadere_console_with_all_scenario_files.py", exclude scenarios for "TESTOVM" because they are outdated.

Renamed "run_vadere_console_with_all_scneario_files.py" to "run_vadere_console_with_all_scenario_files.py" and call it in ".gitlab-ci.yml".