orca

Copperbox revision 3000.

I've implemented a new revision of Orca that simplifies the syntax builder monad. The intention is to then wrap this monad again in a Reader that simulates "environment acquisition" - so the dull parameters like table index for oscillators can be acquired from the environment rather than taken directly from function parameters. This should make the parameter lists of functions smaller (thus hopefully clearer) and allow late binding (so hopefully configuration is more flexible).