Remove stuff

Preparing for a very simple parser.

src/builtin.rs

@@ -1,4 +1,21 @@
+// Possible future built-ins
+//
+// #get - Get table's value at a key/path
+// #set - Set table's value at a key/path
+// #raw - Interpret values literally (either recursively or only one layer)
+// #path - Construct a path from a table
+// #scope - Execute a command in a new sub-scope
+// #loop - Repeat a command infinitely
+// #break - Break out of an infinite loop (with a value?)
+// #if - Conditionally execute one of two commands
+// #print - Print a string to stdout
+// #input - Read a line from stdin
+// #read - Load the contents of a file as string
+// #write - Store a string into a file
+// Arithmetic: #add #sub #neg #shiftr #shiftl
+// Booleans: #and #or #not #xor #andb #orb #notb #xorb
+// Comparisons: #eq #neq #lt #le #gt #ge
+
+/// Built-in operations
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum Builtin {
-    Print,
-}
+pub enum Builtin {}