Constants tracking issue

[VonTum]

Constants are SUS's way of building compile-time functions.

// Basic builtin constants
__builtin__ const bool false {}
__builtin__ const bool true {}
const bool hundred_pi {HUNDRED_PI = 314}

// But also, compiletime functions, and builtins like
__builtin__ const int sizeof #(T) {}
const int factorial #(int num) {
  factorial = 1
  for i in 1..num {
    factorial = factorial * i
  }
}

• Parser
• Initialization
• Flattened
• Typecheck
• Get constant value in execute
• Expand to support functions like factorial too