2.3/field maps and other shit

There is a commit here that fixes edit profile #3041
Now we have field mapping

```php
Cp\Entries::table('Pyro\Module\Streams_psr\Model\MyEntry')
	->fields(array('name' => '{{ entry:user:email }} {{ entry:page:id }}', // do crazy shit
		'created_by', 
		'user',
		'datetime'
	))
	->title('Entries')
	->select(array('name', 'datetime', 'user', 'page')) // optimize query
	->headers(array('name' => 'Bullshit')) // customize table headers
	->buttons($buttons)
	->render();
```