Early Stage C Build

This is the earliest build of the Xenon language, entirely in C. From here on, the language will be grown by interfacing C and C++, to allow for simpler error handling and other features of the language.

This build contains:

• The XenEnv hashtable for storing variables
• The XenMachine struct to function as the main virtual machine
• The XenString, XenChar, XenBool and XenInt object classes
• The XenObject base class which facilitates streams
• The XenReaction struct with implements reactions as dynamic objects
• The ObjectPrinter class.