remove some old macros

examples/demo.rs.fixme

@@ -108,10 +108,10 @@ impl Handle<Tui> for Demo<Tui> {
     fn handle (&mut self, from: &TuiIn) -> Perhaps<bool> {
         use KeyCode::{PageUp, PageDown};
         match from.event() {
-            key_expr!(PageUp) => {
+            kexp!(PageUp) => {
                 self.index = (self.index + 1) % self.items.len();
             },
-            key_expr!(PageDown) => {
+            kexp!(PageDown) => {
                 self.index = if self.index > 1 {
                     self.index - 1
                 } else {