Added APSK layered radio by copying 802.11 and lots of renaming, refactoring.

TODO: Remove OFDM subcarriers and channel spacing.
TODO: Remove different encoding/modulation of signal/data field.
TODO: Remove non-complient/complient duality.
TODO: Remove interleaving?
TODO: Remote scrambling?
Removed channel spacing from APSK layered radio.
Eliminated rate from APSK layered radio.
Removed OFDM subcarriers from APSK radio.
Removed compliant/non-compliant mode from APSK radio.