impr(cockpit): add help text to engine selection

related to #CAM-829
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(engine): extend usage of process definition suspension state

- cascade suspension to process instances and tasks if desired
- only allow task interaction for active tasks
- only allow event receiving for active executions

contributes to CAM-447
improve(engine): update deployment cache if required

- fixes inconsistencies if process definition is
suspended while a non-suspended version still exists
in the deployment cache

contributes to CAM-447
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(engine): remove guard when updating cached definition
chore(engine): remove unused engine configuration parameter
feat(engine): expose filtering by suspended/active in ExecutionQuery

contributes to CAM-447
fix(engine): add suspension state to mysql tables

contributes to CAM-447
test(engine): test optimistic locking for execution suspension

- ensures that the execution revision is updated in case of a
cascading process definition suspension such that concurrent
modifications fail with an optimistic locking exception

contributes to CAM-447
fix(engine): simplify update suspension state statements

- fixes issues on postgres with table aliases for execution and task

contributes to CAM-447
feat(upgrade-scripts): add task suspension state column

contributes to CAM-447
feat(click): Add click actions to process diagram

related to CAM-719
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(engine): fix instance suspension with call activities

- a finished called process instance should not be able to resume
a suspended parent

related to CAM-447
feat(engine): add explicit exception type for suspension issues

- thrown if an interaction with an entity (task, execution, definition)
is disallowed, because the entity is suspended

related to CAM-447
feat(click): Improve click behavior on diagram

related to CAM-719
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(title): replace little c with an capitalized C in camunda Cycle

Closes: CAM-917
chore(engine-IT): add spring PA EL testcase