Recognize "Command"/"Cmd" in keybindings

doc/changelog.asciidoc

@@ -35,6 +35,8 @@ Changed
   to `<Shift-Escape>`, which makes pasting from the clipboard easier in
   passthrough mode and is also unlikely to conflict with webpage bindings.
 - The `app_id` is now set to `qutebrowser` for Wayland.
+- `Command` or `Cmd` can now be used (instead of `Meta`) to map the Command key
+  on macOS.
 
 v1.4.2 (unreleased)
 -------------------

qutebrowser/keyinput/keyutils.py

@@ -270,8 +270,10 @@ def _parse_special_key(keystr):
     replacements = (
         ('control', 'ctrl'),
         ('windows', 'meta'),
-        ('mod1', 'alt'),
         ('mod4', 'meta'),
+        ('command', 'meta'),
+        ('cmd', 'meta'),
+        ('mod1', 'alt'),
         ('less', '<'),
         ('greater', '>'),
     )

tests/unit/keyinput/test_keyutils.py

@@ -214,8 +214,10 @@ class TestKeySequence:
     @pytest.mark.parametrize('orig, normalized', [
         ('<Control+x>', '<Ctrl+x>'),
         ('<Windows+x>', '<Meta+x>'),
-        ('<Mod1+x>', '<Alt+x>'),
         ('<Mod4+x>', '<Meta+x>'),
+        ('<Command+x>', '<Meta+x>'),
+        ('<Cmd+x>', '<Meta+x>'),
+        ('<Mod1+x>', '<Alt+x>'),
         ('<Control-->', '<Ctrl+->'),
         ('<Windows++>', '<Meta++>'),
         ('<ctrl-x>', '<Ctrl+x>'),