Simple refactoring, just introducing interface for datamodel. This change is without bc break. Now it is possible do to change datamodel with new method setDataModel.

 Can change grid datamodel

… has a value eg. with `.`, the jQuery sizzle engine throws an error when there are no qutes around the value.

Fixing missing quotes in CSS attribute selectors

- defining blocks for column actions and inline add/edit buttons
- these blocks can be overwritten and custom render can be used (change order, grouping of buttons, etc.)

Defining blocks for column actions and inline add/edit buttons

- `\Nette\Forms\Controls\Checkbox::getControl` returns label part and control part like one ``\Nette\Utils\Html` and then `$control->getControl()->getAttribute('class')` is always null and custom defined classes are always overwritten by `$control->setAttribute('class', 'form-control input-sm form-control-sm');`
- fixed by using `\Nette\Forms\Controls\BaseControl::getControlPrototype` which always returns only control part without label part

Fixing custom classes on checkbox in inline edit