Make spoiler buttons work again

[DosAmp]

Two problems have to be solved so that spoiler buttons as implemented in MyCode also work on whfefe:

• the quote scrubbing function must be modified to both detect the opening (<blockquote style="display:none;" class="spoiler">) and closing quote tag of spoiler containers and leave them alone
• the Javascript code in tags must be fixed, preferably in an external script

Currently broken example:

<li><!-- ... -->
<br>
<div>
<button type="button" onclick="this.update('Spoiler '+(this.next('blockquote').toggle().visible()?'verstecken':'anzeigen'));">Spoiler anzeigen</button><br>
<blockquote style="display:none;" class="spoiler"><!-- content of spoiler goes here -->
<!-- {/blockquote} tag is missing here, which also clobbers $quotedepth and throws off nested quotes/spoilers -->
</div><!-- ... --></li>