ui: rename Ui class to UrwidUserInterface

pqcli/ui/urwid/read_only_check_box.py

@@ -0,0 +1,16 @@
+import urwid
+
+
+class ReadOnlyCheckBox(urwid.Text):
+    def __init__(self, text: str, state: bool = False) -> None:
+        self.icons = {
+            key: widget.text for key, widget in urwid.CheckBox.states.items()
+        }
+        self._caption = text
+
+        super().__init__("")
+
+        self.set_state(state)
+
+    def set_state(self, state: bool) -> None:
+        self.set_text(self.icons[state] + " " + self._caption)