Use existing loader code to make hi-fi decode able to load different formats/sample rates

[oyvindln]

[oyvindln]

We probably also don't need it to process at 40 mhz

[harrypm]

We probably also don't need it to process at 40 mhz

It would probably be best to keep the 40mhz defacto mode like vhs-decode for DdD user's sake but 10-bit packed support is more a priority as noted in #77