[MAINTENANCE] Adjust css class names in TOC Plugin

[beatrycze-volk]

No description provided.

[sebastian-meyer]

Why the renaming? Everybody who uses the default templates will have to adjust their CSS files...

[beatrycze-volk]

Because we use here mixed naming conventions:

<div class="tx-dlf-tableofcontents">
    <ul>
        <f:render partial="TableOfContents/Children" arguments="{children: toc, viewData: viewData}"/>
    </ul>
</div>

Ine the Main.html we have tx-dlf-tableofcontents, and then tx-dlf-toc. It would be good to unify it. It matches the standard approach where css classes are created 'tx-dlf-pluginname-xyz'.

Plus new names are more clear and descriptive.