Debug toolbar table CSS classnames missing djdt prefix

[Brobin]

I had my own css class called .timeline and it conflicted with the SQL query timeline such that it overflowed the page. It took me quite a bit to find that the root cause was conflicting class names. Perhaps it should have a debug toolbar prefix like .djdt-timeline?

I noticed this is in place for some, but not all of the th classes. Adding it to .query and .timeline would probably be best for consistency.

<tr>
    <th class="djdt-color">&nbsp;</th>
    <th class="query" colspan="2">Query</th>
    <th class="timeline">Timeline</th>
    <th class="djdt-time">Time (ms)</th>
    <th class="djdt-actions">Action</th>
</tr>