Removed LLVM dependancy
Replaced all LLVM-specific code with bytecode implementation
Implemented bytecode compiler (partial)
Implemented bytecode emitter (partial)
Implemented virtual machine bytecode interpreter (partial)
Implemented string parsing and evaluation in parser
Adding files missing from previous commit.
Initial bytecode implementation with slight modification to parser for variable-scoping (experimental).
Refactor with initial integration of scope / symbol API.
Started engine implementation.