Add simple time trigger test.
Add delay event trigger.
Grammar update.
Not operator update.
Not syntx.
Choice conflict fix.
Update generic visitors.
Remove old filter syntax.
Allow filter in event block.
Merge branch 'develop' into feature/trimeTrigger
Fix multiple operator problem.
Fix parser tests.
Tree update and clean up.
Not operator updates.
Ele Generation clean up and event based not operator.
Event based not operator and ele generation updates.
Merge branch 'feature/trimeTrigger' of https://github.com/play-project/play-dcep into feature/trimeTrigger
Structure update.
Clean up.
Litte bug fixes in tests.