allow exiting from modals; add buttons

src/keys/quit.rs

@@ -1,14 +1,17 @@
 use crate::*;
 
 impl Taggart {
-    pub fn mode_quit (&mut self, event: &Event) {
-        todo!()
-    }
     pub fn quit_begin (&mut self, input: &TuiIn) {
         if self.tasks.len() == 0 {
             input.done()
         } else {
-            self.mode = Some(Mode::Quit { value: false })
+            self.mode = Some(Mode::Quit { value: 1 })
+        }
+    }
+    pub fn mode_quit (&mut self, event: &Event) {
+        match event {
+            press!(Esc) => { self.mode = None },
+            _ => todo!()
         }
     }
 }