Interpreter and intermediate format

[SpencerPark]

The compiler has a pseudo intermediate format currently which is just java objects. The compiler generates intermediate code by creating these "Expression" objects which are then executed afterwards. It would make sense to add an intermediate, language agnostic, format that can be interpreted on it's own.

Completely separating an interpreter from the compiler would better support a plugin API and native interface. These things would depend only on the interpreter and could detach from the compiler entirely. Conceptually this is a better place for them anyways.

To get this done there needs to be an explicit, well defined, intermediate standard. Diverging the 2 projects will make implementing new features a bit more extensive but would better encourage backwards compatibility hopefully resulting in a more stable language.