Add system codec support / additional formats

[devellison]

Currently the camera codec support is very limited and a rudimentary C++ (slow) implementation.
Should default to using the system codec support on both where possible, but we can also add our own optimized decoding.
Decoding is very limited right now and needs to be cleaned up.

Should also allow client to receive undecoded frames if desired.

Additionally, it'd be nice to have the option of type of memory used for destination, e.g. get it into GPU RAM asap if desired.