refs #5977 group goals in a menu if there are more than 3 goals. I reused an existing menuDropDown component that was already used for Language and Usermenu. I removed the round border there as all our other components to not have round corners. Also had to add some z-index because Segment and Date picker define a z-index. So to make sure the components are correct visible I had to add a z-index to the submenu and therefore to the top menu. I hope this does not introduce any side effects. Tested with leftMenu and with ZenMode...
Merge branch 'master' of github.com:piwik/piwik