Added view option to render a view with Yii inside tab content

[nilsburg]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌
Fixed issues

Adds the posibility to render a view inside a Tab content.

echo Tabs::widget([
    'items'   =>[
        [
            'label'   => 'Tab label',
            'view'    => ['@app/views/site/my-view',['param1'=>'value1']],
            'visible' => true,
        ],
    ],
]);

The main benefit is that when used with visible = false it won't render the view.