fix(distro): h2database library in jboss & wildfly

related to #CAM-2707
feat(engine): add filter entity, manager and service

- add new process engine service for filters
- add filter entity
- add support for create/delete/update/query/execute of a task filter

related to #CAM-2628, #CAM-2630
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(engine): do not change job retries on OptimisticLockingException

- all other job properties are updated as if the exception is any
  exception, that means the error message is populated and the lock
  expiration time configured according to a custom retry strategy

related to CAM-2705
fix(jboss): load script resources from PA classpath

Set TCCL to Classloader of the process application when executing
the deployment.

This makes it possible to load script resources from a process
application.

related to #CAM-2711
fix(engine): fix typo of DbEntityManager

- typo was introduced during the refactoring of the persistence
  layer

related to #CAM-2602
chore(engine): extract entity name constants into single class