[PATCH] Remove unused code

[Chr. Rossmanith]

Hi,

I had a look at unusedcode.easy (sdext/presenter) and removed a little 
bit more than mentioned there: as there are no end callbacks added 
(AddEndCallback() was unused), there is no need to run them -> 
RunEndCallbacks() could be removed as well. Same logic for start 
callbacks. Finally mpStartCallbacks and mpEndCallbacks could leave, too.

In PresenterAnimator AddAnimation() was unused and it seems that the 
whole class might be removed?!?

It builds successfully but nevertheless a review would be nice.

Christina