[WIP] Introduce Console rendering strategies and more incremental changes.
[WIP] Introduce Console rendering strategies and more incremental changes.

- Console\Response now supports setting and getting errorLevel (stored as metadata).
- Console\Response now properly supports send()ing, including exiting the application with an error level.
- Add Mvc\View\Console\DefaultRenderingStrategy for building console response from plain-text action controller
responses.
- Currently, the default console rendering strategy does NOT use Zend\View nor Rendering to produce responses (it
just concatenates plain-text responses from controllers and puts them into console response object)
- Remove View\Strategy\ConsoleStrategy because of its bad design.

Maks3w/zend-console,MadCat34/zend-console