* Added setCustomTopBodyElement allowing to define custom HTML to be added at the top of the "<body>" tag.
* Change custom top body element to 'header'
This will make more sense once a footer is added. No functional changes.
* Make custom header concat conditional
Matching the _bodyClass comparison above
* Create getHTTPEnd function
* Add custom body footer functionality
* Fix <small> close tag on update page
* Add missing HTTP ends to exit and close
* Remove 'immediately' from header/footer desc
It's not immediate, the 'wrap' div is added before/after.
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Co-authored-by: Andreas Breitschopp <a-breitschopp@ab-tools.com>