Make AbstractAnimator more re-usable

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Add a TranslationAnimator

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
introduced additional abstract class AbstractTransformAnimator, such that
animators that do not provide an AffineTransform3D (TextOverlayAnimator) do
not have to implement this dummy functionality.
Revised comments and reformatted to imglib2 code style.
Merge branch 'importer'
Merge branch 'importer'
Added better method to extract approximate rotation from affine transform.
The plane that should be respected by the approximate rotation can be chosen.
refactored IO timing out of Hdf5GlobalCellCache.
(there might be other caches at some point)