Implements a lot of new stuff for the Dune patch.

- Flips pan on Membranes
- Implements ADSR of Stratum
- Key bindings for each of the eight Stratum (ASDFGHJK)
- Implements GUI elements for Membranes and Stratums
- Starts surfacing some top level GUI para controls for the Membranes

Signed-off-by: Colin McArdell <colin@colinmcardell.com>