Gave $action variable to the button view

[Debatty-Tom]

Cover #42 and #43. Gave $action variable to the button view to allow more customization on the button itself. Allow the user to publish the button view and change it to something like that.

<form action="{!! $url !!}" {!! $attributes !!}>`
    @csrf
    <button type="submit" class="{!! $basename !!}__link @if($action === 'reset') do something @endif">
        <span class="{!! $basename !!}__label">{{ $label }}</span>
    </button>
</form>

[toonvandenbos]

I'm waiting on PR #96's final approval before reviewing this one.