Alot of visual changes, created + added Pocket WBS logo

- New 'View Element' activity, rename can be done on the same page now
... have to press back to save details for now. If user switches to
another element then changes aren't saved

- New MenuActivity page, just some visual changes.

- New GUIMain page, mostly visual changes
  ..algorithm for shifting elements is too complex, may have to
implement user input in the future.. maybe a drag to reposition...