[Jux] Added edit icons to menu items in frontend, improved modules edit icons, and fixed admin toolbar edit icon transition effect (Reproduced Pull request #72 of joomla-projects/joomla-cms branch jux)
Merge pull request #162 from beat/jux-rebased

[Jux] Added edit icons to menu items in frontend, improved modules edit icons, and fixed admin toolbar edit icon transition effect (Reproduced Pull request #72 of joomla-projects/joomla-cms branch jux)

(was already tested at JUX Code-sprint, just rebased same code to add the menu edits into jux-rebased).