`model` package should not use `domains` package

[z2sx]

Domains is for VDoc and other domains, model domain should be fully defined by core and model package should rely on core only. Please let me know if you have any concerns about this.

[z2sx]

To achieve this, very likely we need to move tx domain to core. This is fine, because we're going to implement modifiable model and model-specific Txes will live in core.

[haiodo]

Right now model is not a real model but a DLS + model definition combined from core(classes mostly) + model( tx, space, references, etc).

Should we think about?

1. model -> model-dsl (without a real models), it will depend only on core, since require classes.
2. model -> core-model - > a model definitions for core. (will contain model.ts)
3. model -> domains-model -> a model definitions for domains. (will contain model.ts)
4. model -> model-cli - will scan and import all model.ts files and generate a real model into (DB, json, etc).

[z2sx]

Too much separation for now and would not help to understand minimal core requirements. To achieve this it's enough to move model-domains out of model (3). 1, 2 & 4 will rely on core and can stay in model for now.