Add hidden 'q' command, alias for exit

In the tools menu, 'exit' previously returned you to the mod menu. This
has been revised. 'exit' will now close ammo completely, as will 'q',
regardless of which menu is active. To return to the mods menu from the
tools menu, use 'mods' command.

ammo/tool_controller.py

@@ -347,7 +347,7 @@ def install_download(index, download) -> None:
 
             install_download(index, download)
 
-    def exit(self) -> None:
+    def mods(self) -> None:
         """
         Return to the mod controller
         """

ammo/ui.py

@@ -90,6 +90,7 @@ class Command:
     args: list[Arg]
     doc: str
     instance: Union[Controller, None]
+    visible: bool
 
 
 class UI:
@@ -149,6 +150,7 @@ def populate_commands(self):
             args=[],
             doc=str(self.help.__doc__).strip(),
             instance=None,
+            visible=True,
         )
 
         # Default 'exit', may be overridden.
@@ -158,6 +160,17 @@ def populate_commands(self):
             args=[],
             doc=str(self.exit.__doc__).strip(),
             instance=None,
+            visible=True,
+        )
+
+        # Make 'exit' available from 'q' too.
+        self.command["q"] = Command(
+            name="q",
+            func=self.exit,
+            args=[],
+            doc=str(self.exit.__doc__).strip(),
+            instance=None,
+            visible=False,
         )
 
         for name in dir(self.controller):
@@ -224,6 +237,7 @@ def populate_commands(self):
                 args=args,
                 doc=str(func.__doc__).strip(),
                 instance=self.controller,
+                visible=True,
             )
 
     def help(self):
@@ -235,6 +249,8 @@ def help(self):
         column_doc = []
 
         for name, command in sorted(self.command.items()):
+            if not command.visible:
+                continue
             column_cmd.append(name)
             column_arg.append(" ".join([arg.description for arg in command.args]))
             column_doc.append(command.doc)