cl-typeck: More type inference

- Renamed "intrinsic" -> "primitive"
  - I thought it was funny, but it's just annoying.
- Rename "Uninferred" -> "Inferred"
  - It's a concrete type, but an inferred one.
- Add lifetimes to the Entry API
- Categorize does not care about recursive types. You can't have a recursive AST.
- Added helpful constructors to the inference engine
- Added some overloadable operators to the inference engine
  - These are a MAJOR work in progress
- Reorganized the Inference implementation file by functionality.

stdlib:
- Updated standard library.

stdlib/std/range.cl

@@ -1,9 +1,17 @@
 //! Iterable ranges
 
+type T = _;
+
 /// An Exclusive Range `a .. b` iterates from a to b, excluding b
-#[intrinsic = "range_exc", T]
-struct RangeExc(T, T)
+// #[lang = "range_exc", T]
+pub struct RangeExc(T, T)
 
 /// An Inclusive Range `a ..= b` iterates from a to b, including b
-#[intrinsic = "range_inc", T]
-struct RangeInc(T, T)
+// #[lang = "range_inc", T]
+pub struct RangeInc(T, T)
+
+impl RangeExc {
+    fn next(this: &RangeInc) -> T {
+        (*this).0
+    }
+}