Unboxing types

[SquidDev]

A recent profile of the latest version shows (unsurprisingly) that the slowest part of the code is boxing/unboxing numbers.

I feel the best thing to do would be to generate a specialised bytecode which uses doubles instead. However this would require tracking the types of variables to see where it is worthwhile not boxing the types.

• [x] Incremental/delayed compilation
• [ ] Specialise functions
• [ ] Specialising function calls
• [ ] Removing debug API calls when not needed
• [ ] Inline calls to math.* and bit.* functions