Refactor syscall creation script

The current FreeBSD system call creation script was implemented to streamline the introduction of system calls into the FreeBSD kernel. It’s a monolithic script, converted from awk to Lua, and has kept much of the procedural-oriented awk code. It does not take full advantage of modern features of Lua (object-oriented design) and is difficult to extend. The goal is to strip the current script into an easily extendable interface. It will utilize classes to give extensible methods to objects, mainly utilizing the facade and command design patterns, to give a more "bite-sized" interface to the previously procedural code. This will allow easier maintenance of the Lua tables and procedures, and a better platform to add more. Lua modules will provide better namespacing of globals, dynamic generation of output files, and more modules with different tasks may be easily added. After refactoring, the previous functionality of the original script can be achieved simply by calling the necessary modules. The benefit to FreeBSD is further streamlining in the creation of system calls, a more maintainable interface, and a strong foundation to build upon in the development of future system call creation tools. It will further demystify the process of system call creation and allow others to more easily contribute. Deliverables are (1) system call creation will work as before; (2) the monolithic script will be refactored into core, modules, and classes; (3) a system call creation library that is easily extensible; and (4) well-documented with conventions used.