There are implementations for float, Vector2f and Vector3f for the Low
Pass Filter and the *2p filter. I tried to implement these filters
with one common template implementation. This implementation saves
some lines of code and reduced the redundancy. One could save even
more code if the currently overloaded isinf/isnan functions and checks
can be removed.
Signed-off-by: Daniel Frenzel <dgdanielf@gmail.com>