NAC3 compiler

This repository contains:

• nac3ast: Python abstract syntax tree definition (based on RustPython).
• nac3parser: Python parser (based on RustPython).
• nac3core: Core compiler library, containing type-checking and code generation.
• nac3standalone: Standalone compiler tool (core language only).
• nac3artiq: Integration with ARTIQ and implementation of ARTIQ-specific extensions to the core language.
• runkernel: Simple program that runs compiled ARTIQ kernels on the host and displays RTIO operations. Useful for testing without hardware.

The core compiler knows nothing about symbol resolution, host variables etc. nac3artiq and nac3standalone provide (implement) the symbol resolver to the core compiler for resolving the type and value for unknown symbols. The core compiler only type checks classes and functions requested by nac3artiq/nac3standalone (the API should allow the caller to specify which methods should be compiled). After type checking, the compiler analyses the set of functions/classes that are used and performs code generation.

value could be integer values, boolean values, bytes (for memcpy), function ID (full name + concrete type)