Update to new Params API

Updated the block as discussed in #3. Added support for the new api but left the deprecated functions for the old one, until Cinder removes them.

It might still need some work. This block supports less types than the functions in Params, so some of them (like char, or uint) might not work well.
I'd suggest using the types defined in AntTweakbar (TW_TYPE_FLOAT instead of _FLOAT, for example) for a better match to what Params.h supports.