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/obj/int.rs

@@ -0,0 +1,30 @@
+use crate::obj::prelude::*;
+use shredder::Scan;
+
+pub type IntRef = ObjRef<Int>;
+
+#[derive(Debug, Scan)]
+pub struct Int {
+    value: i64,
+    vtable: Vtable,
+    attrs: Attrs,
+}
+
+impl Int {
+    pub fn new_obj(value: i64) -> ObjRef<Self> {
+        // TODO : vtable for Int
+        let obj_ref = ObjRef::new(Self {
+            value,
+            vtable: Default::default(),
+            attrs: Default::default(),
+        });
+
+        obj_ref
+    }
+
+    pub fn value(&self) -> i64 {
+        self.value
+    }
+}
+
+impl_obj_readonly!(Int);