fix boolean operators

- remove Logical expressions
 - add basic token return type to LLVMTypeRef converter
 - add codegen for Bool literals
 - fix "and" and "or" being identified as identifiers

examples/hello.ry

@@ -1,7 +1,11 @@
 // import std;
 
 fn add() i32 {
-    return 1 + 1;
+    return 69 + 69;
+}
+
+fn and_fn() bool {
+    return true and false;
 }
 
 // type is void by default