Add defc macros

[jamesaorson]

Is your feature request related to a problem? Please describe.
All of the math operations of Daybreak are defined as macros. These should be defined in Daybreak and not be defined directly as C code in the generation step.

Describe the solution you'd like
This should be the syntax for macros

defc add(x y) do
  // ASM code in here, asm being whatever output language we are generating
  ((x)+(y))
end

Describe alternatives you've considered
I have considered directly taking the C syntax but that feels nasty. This is consistent with the language's general design.

Additional context
This will be the equivalent to emitting assembly for our language for expressions. Our assembly being the underlying language you emit to.