Merge branch 'hotfix/1.3.2'
Merge branch 'release/2.0.0'
Merge branch 'release/2.0.1'
Merge branch 'release/2.0.2'
Merge branch 'release/2.0.3'
Merge branch 'release/2.1.0'
Merge branch 'release/2.1.1'
Initialize HookExternalId with empty String

... because the db constraint is NOT NULL.
Merge branch 'webflo-patch-1' into hotfix/2.1.2
Bumped version
Merge branch 'hotfix/2.1.2' into develop

Conflicts:
	src/Plugin/GitLab/SyncAdapter.php
	src/Version.php