Add "Empty %s Area" text to empty areas.
Fix "area tab" not disappearing, show all active drag areas when add panel is active
Show drag areas when dragging block types.
merge conflicts
Merge branch 'fix_ux' of https://github.com/KorvinSzanto/concrete5-5.7.0 into KorvinSzanto-fix_ux
Merge branch 'KorvinSzanto-fix_ux' into develop
Merge branch 'develop' of github.com:concrete5/concrete5-5.7.0 into develop