Annotatecc for source-level debugging in FCEUX

Annotatecc is a tool that integrates cc65 and FCEUX, providing C-source listings in the debugger. It was originally developed while I was working on The Wit.nes, and I recently cleaned it up in order to open source it.

An example project is included in the repo. Instructions to use it in an existing project are in the README, hopefully it's straight-forward enough.

https://github.com/dustmop/annotatecc65

Here's a screenshot showing annotatecc in action for the example ROM.