refactor -- start putting together the Winx frontend properly

[cheenar]

The entire winx binary relies on the monolithic winx.cpp. While there are advantages for development & testing, it's probably time to start pulling this apart and creating a proper wrapper on top of V8's startup.

Probably want to support the following:

• Create Function/Object templates for registration
• Create way to load polyfill(s) scripts (embedded or passed in)
• Separate CLI parsing logic and setting up globals
  • Investigate if we need to actually use globals or is there something better
• Separate script execution

These few items should clean things up a bit, especially for better JNI integration (right now it's just a hook around the monolithic start up function).

[cheenar]

Frontend is a bit better now following the creation of the WinxEngine. I feel there is still a lot of room for improvements.