Contacts and contact types

[roman-yagodin]

Need to allow define contact types and also allow to assign any number of contact records for employees and divisions and possibly share division contacts across its employees.

Another option - distinct employees and real peoples in the model, but this would increase complexity of base model w/o adding significant outcome.

Related issues: https://github.com/volgau/R7.University/labels/contacts

[roman-yagodin]

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