[163] Add implicit constraint

This allows the concept 'Merger' to be connected to 'SynchronizerAND' as well
as to 'SynchronizerOR'. This should allow for the following semantical correct
combination of concepts to be connected to each other:

'AnyProcess's -> 'SynchronizerOR'|'SynchronizerAND' -> 'Event'
Merge branch 'feature-163' into develop