Remove a large amount of deprecated functionality

Spring cleaning is here! In the Fall! This commit removes quite a large amount
of deprecated functionality from the standard libraries. I tried to ensure that
only old deprecated functionality was removed.

This is removing lots and lots of deprecated features, so this is a breaking
change. Please consult the deprecation messages of the deleted code to see how
to migrate code forward if it still needs migration.

[breaking-change]

src/libsyntax/ext/build.rs

@@ -618,7 +618,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                         ident: ast::Ident,
                         mut args: Vec<P<ast::Expr>> ) -> P<ast::Expr> {
         let id = Spanned { node: ident, span: span };
-        args.unshift(expr);
+        args.insert(0, expr);
         self.expr(span, ast::ExprMethodCall(id, Vec::new(), args))
     }
     fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {