updated the Configuration activity to use view pager instead of tab host. this allows the user to swipe
bug fix: markers not showing after screen rotation.
feature update: made the list of markers invisible until the addition of one. made background semi transparent as well.
Editor: Adjust the map padding depending if the mission list is visible or not.
Editor: Fixing start-up updates on the Editor list padding

Now the padding and visibility of the missionList is correctly updated on every start-up condition.
Small change to the inferface so it can be used by local methods of editorActivity.
Merge pull request #476 from arthurbenemann/fix_editor_bottom_bar

Fix editor bottom bar. Closes issue #452.