Add (the most important) command line switches from the LuaJIT executable

[rdw-software]

Goals:

• [ ] Can use the runtime directly to save bytecode
• [ ] Can dump traces and other stuff directly
• [ ] Can eval code directly
• [ ] Possibly some others from this list

This will be useful when running code that won't work in stock LuaJIT.

Eval is mostly for debugging, but shouldn't be difficult to implement.