DropdownMenu component is meant as a way to describe the content of menus.
Syntax:
```
<DropdownMenu as |dm|>
<dm.item class="test">
First
</dm.item>
<dm.divider class="foo" />
<dm.item class="bar">
Second
</dm.item>
</DropdownMenu>
```
This commit adds a new option `@modalForMobile` for `<DMenu />` which allows to display a `<DModal />` when expanding a menu on mobile.
This commit also adds a `@views` options to toasts which is an array accepting `['mobile', 'desktop']` and will control if the toast is show on desktop and/or mobile.
Finally this commit allows to hide the progressBar even if the toast is set to `@autoClose=true`. This is controlled through the `@showProgressBar` option.
