0.4.0

• Better error messages with added cursor information.
• Optimized function compilation and application.
• Tail-recursion optimization.
• Added a unified mechanism for doing host-interop.
• Primitive arrays are now treated as distinct types from the general Array type.
• Program definition is now a feature of Lux itself, instead of the host platform.
• Decision trees for pattern-matching optimization.
• Various bug fixes and refactoring.