Navbar lack of personalization

[yii-bot]

This issue has originally been reported by @invaderhd at yiisoft/yii2#7499.
Moved here by @cebe.

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In a project I use Navbar extensively and I found that it should be more generic, for example:

• we should be able to set the the only the classes that we want to use, but it append allwais the navbar class (ie. Html::addCssClass($this->options, 'navbar'); )
• it's impossible to remove the toggle button (ie. echo $this->renderToggleButton();). In some layouts we may have the toggle button in a different local.

The Navbar is a great class and works like a charm in the default bootstrap theme, but in custom layouts it is not generic enough to do it job.

Keep the good working guys ;)

[klimov-paul]

we should be able to set the the only the classes that we want to use, but it append allwais the navbar class (ie. Html::addCssClass($this->options, 'navbar'); )

This is already possible:

'options' => [
    'class' => ['widget' => null],
],

it's impossible to remove the toggle button (ie. echo $this->renderToggleButton();). In some layouts we may have the toggle button in a different local.

This can be considered.