Add support for initializers in interpreter #8
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This commit add support for let's and register's initializers. These initializers are executed before the main entry point. This prompted some changes in the interpreter. Since there's no longer a single "entry" function but rather a list of initializers followed by the "entry" function, the interpreter maintains a worklist of functions to execute (in `todo` instvar) and when the bottom-most context returns, it simply executes next function in the worklist. Interpretation finishes once all functions from worklist are executed and return (see `JibInterpreter >> interpretEnd:`). Another little complication comes from the fact that - for some unknown reason - initializers do not have explicit `end` instruction. To deal with this, after each instruction executed the interpreter checks if the PC (of next instruction) is beyond the end of instruction sequence and if it is, executes fabricated `end`. This way, the function return logic is at single place (`JibInterpreter >> interpretEnd:`).
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This PR depends on #7 (for parsing
letandregisterinitializers).