Shoes::App now support absolute_* methods for background compat

* expert-tankspank-adjusted.rb did not run before (probably when
  a background is on the top level, then the app is the parent)
* decided to go with returning a consistent 0 for both, because
  well the top left of the app is the origin of the coordinate
  system
* comitting from 10363m up in the air - weehhuuu :plane:
Made app_spec more uniform

* use opts instead of args everywhere
* use subject for normal cases, get rid of app for them
Redraws after move calls through RedrawingAspect

* Applies to all objects that were using the Move module
* Removed the move module
* the redraw specs/movable shape specs had to be temporarily
  removed since adding and removing the RedrawingAspect isn't
  that easy, we'll have to figure something out here
AbsoluteDimensions for objects that are always absolutely positioned
Redrawing for move (clear out the old area of the object)

* in general this is a bit fuzzy - maybe for now we'd be better
  off just redrawing the whole area after animate/button/whatever?
  we are already doing that for change style and adding new
  elements... either whole app all the time or we go smaller scale
  for all of them