Blockmanager: Fixed scripts in blocks being executed
Remove obsolete Firefox workaround
Don't clear away <hr>s RT#56465
Improve bugfix for RT#56465

- Define a list of usually empty, self closing block elements in html.js
- Add a set subtraction method to arrays.js
- use both in a improved fix in blockelementcontenthandler.js
Merge pull request #996 from wigentics/hotfix-rt56465

Fix for RT#56465

Some changes will need to be made to this patch after the merge...
Complete list of void elements and correct variable name
Merge pull request #998 from najor/hotfix

Hotfix block landing areas rt55878

Some code style issue to be resolved after this merge...
Improve inline block padding algorithm
Correct inline block padding algorithm
Fix jslint errors