chore, allow to decl init args and in args in declcoru(), provide convenience defcoru again

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, migrate to declcoru/defcoru pairs

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'core/coru'

* core/coru:
  chore, migrate to declcoru/defcoru pairs
  chore, allow to decl init args and in args in declcoru(), provide convenience defcoru again