feat: basic animation support added to NiftyNode

Execute a custom NiftyCallback implementation every interval ms. There
is a special method added as well that automatically calls requestRedraw
after interval ms as well.

With this feature UseCaseUpdateable in the NiftyUseCaseRunner (examples)
is not needed anymore and has been removed! This makes the examples even
better :)
chore: prepare wrap text
chore: update easymock to version 3.2