This allows the destructuring of lists into individual values.
We can have arbitrarily nested lists, can check for constant values and can
have up to one '~'-prefixed variable per list, that will capture the
remaining elements of the list.
It is implemented as a second set of bytecode instructions, which define a
matcher. These matchers should also enable us to implement the same pattern
matching capabiities for function parameters.
Not all matching features are implemented yet, predicate matching and
matching into a dictionary key is not implemented yet.
We can now define and call functions. Lexical closure scopes are also
working :).
It's limited to simple functions or complex functions with a single
argument list of only variable names for now.
