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Modelling and configuration schema improvements

Closes #21

See merge request !12

Unified data modeling tools

See merge request !11

- when obj and expected type match during type validation, full obj is returned

utils: modelling: error message when both transformation function and default value set at the same time

After a discussion, we decided that this situation does not make any sense and we don't
know, how the program should behave. Therefore, we just disallow it.

Error messages now contain information about their origin. If it is known,
the user is informed about the specific place in tree where an error occured.
+ Consolidated all exceptions at one place. closes #21

Propagating TimeUnits to strict data model, because that way, it's not ambiguous
whether they represent seconds or milliseconds.

Datamodel: Network address and file path custom data types

See merge request !9