Added _onCreate _onUpdate and _onDelete methods to logic/models/base.py.
Added _onCreate _onUpdate and _onDelete methods to logic/models/base.py.

These methods can be overwritten by other logic/models/ modules to serve as a way to for instance send out an update message.

Patch by: Lennard de Rijk

MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging,MatthewWilkes/mw4068-packaging