Machine: `interfaces` and multiple operations

[marzipankaiser]

This adds a basic implementation for interfaces and new into Machine and adds a example for usage.

This also supports multiple methods, but llvm currently does not (and JIT is buggy with the passed parameters).

@b-studios and I implemented the basis for this earlier today during our meeting.

[marzipankaiser]

I also now added correctly ordering the methods/operations (in the order they are declared), and multiple operations for effects onto this PR.

[marzipankaiser]

(rebased to current master)