Fold runtime/ crate into this source tree

While I like the idea of having a runtime completely decoupled from the
syntax and compiler, I don't think this is that big of a project for
that to be necessary or even useful yet.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/compile/mod.rs

@@ -1,7 +1,7 @@
 pub mod thunk;
 pub mod error;
 
-use runtime::{obj::prelude::*, vm::consts::*};
+use crate::{obj::prelude::*, vm::consts::*};
 use std::collections::HashMap;
 
 pub struct Compile<'t> {