Design a generic presentation language

[Slava Akhmechet]

Current rendering system isn't flexible enough for advanced stuff.

A declarative interface presentation language needs to be designed that expresses which fields to render and with what method.

Existing rendering code needs to be refactored into presentation methods the declarative language can be implemented with.

Existing rendering interface needs to be modified to create a declarative interface on the fly.

We should still be able to define custom code with generic functions.

[Slava Akhmechet]

Done!