Add HTML Block

[Maingron]

Add Block that allows custom HTML. Maybe with WYSIWYG Editor.
The Text Block can already do that, but maybe improve that.

HTML Example:

<center>
    <p style="font-family: 'segoe ui'; color: black; font-size:30px; text-align: center; line-height: 1.25; padding:10px 40px; font-weight: bold;">
        <span style="font-size:60px;">Anpassbare Uhr</span>
        <br>
        <span style="font-size:50px">mit Modulen</span>
        <br><br>
        <span style="font-size:30px; color: #ffffff">oder</span>
        <br><br>
        <span style="font-size:60px">
            Modulares Dashboard
        </span>
    </p>
</center>