- remove junit4 dependecies
- refactor the unit tests by junit5
- enhance the spring-statemachine-test and spring-statemachine-build-tests so they can work together with junit4/junit5
- relates #779
- Remove most of a static class modifiers from docs
to make things easier if doing copy/paste. Not
all can be removed because some spring inner
config classes has to be static.
- Fixes#123