Describe the bug

The testcase-widget produces redundant HMTL tags: P DIV DIV P

Where 2 of them are easy to identify.

1. P-tag: is cause by $:/core/ui/ViewTemplate/body redundant new-lines
2. Is created by the testcase-widget in testcase.js
   2.1 This one should get a default class eg: class="tc-testcase" similar to the revealwidget
   2.2 The testcase widget should also get a class-parameter so users can define a custom class here
3. No idea yet, where they come from

Expected behavior

Only the necessary DOM elements should be created. Redundant tags should go away.

TiddlyWiki Configuration

v5.3.6-pre
No regression. This is also a problem in v5.3.5