Editor: Make the Tools bar invisible while in multiselect
Merge pull request #525 from arthurbenemann/issue506

Editor: Make the Tools bar invisible while in multiselect
Icon: Changing app icon.

Removed the low dpi icon, because it's mostly not used. Added a xhdpi icon  for better layout on nice screens.
Icons: Removed the low dpi folder because it's mostly not used on android >4.0 devices.
Merge pull request #526 from arthurbenemann/issue516

New Application Icon