Rename the binding universal argument to priority

As per Textualize#1343 (comment)

src/textual/app.py

@@ -298,7 +298,7 @@ def __init__(
 
         self._logger = Logger(self._log)
 
-        self._bindings.bind("ctrl+c", "quit", show=False, universal=True)
+        self._bindings.bind("ctrl+c", "quit", show=False, priority=True)
         self._refresh_required = False
 
         self.design = DEFAULT_COLORS
@@ -1729,20 +1729,20 @@ def _binding_chain(self) -> list[tuple[DOMNode, Bindings]]:
             ]
         return namespace_bindings
 
-    async def check_bindings(self, key: str, universal: bool = False) -> bool:
+    async def check_bindings(self, key: str, priority: bool = False) -> bool:
         """Handle a key press.
 
         Args:
             key (str): A key
-            universal (bool): Check universal keys if True, otherwise non-universal keys.
+            priority (bool): If `True` check from `App` down, otherwise from focused up.
 
         Returns:
             bool: True if the key was handled by a binding, otherwise False
         """
 
         for namespace, bindings in self._binding_chain:
             binding = bindings.keys.get(key)
-            if binding is not None and binding.universal == universal:
+            if binding is not None and binding.priority == priority:
                 await self.action(binding.action, default_namespace=namespace)
                 return True
         return False
@@ -1762,7 +1762,7 @@ async def on_event(self, event: events.Event) -> None:
                 self.mouse_position = Offset(event.x, event.y)
                 await self.screen._forward_event(event)
             elif isinstance(event, events.Key):
-                if not await self.check_bindings(event.key, universal=True):
+                if not await self.check_bindings(event.key, priority=True):
                     forward_target = self.focused or self.screen
                     await forward_target._forward_event(event)
             else:

src/textual/binding.py

@@ -32,8 +32,8 @@ class Binding:
     """bool: Show the action in Footer, or False to hide."""
     key_display: str | None = None
     """str | None: How the key should be shown in footer."""
-    universal: bool = False
-    """bool: Allow forwarding from app to focused widget."""
+    priority: bool = False
+    """bool: Is this a priority binding, checked form app down to focused widget?"""
 
 
 @rich.repr.auto
@@ -60,7 +60,7 @@ def make_bindings(bindings: Iterable[BindingType]) -> Iterable[Binding]:
                             description=binding.description,
                             show=binding.show,
                             key_display=binding.key_display,
-                            universal=binding.universal,
+                            priority=binding.priority,
                         )
                         yield new_binding
                 else:
@@ -107,7 +107,7 @@ def bind(
         description: str = "",
         show: bool = True,
         key_display: str | None = None,
-        universal: bool = False,
+        priority: bool = False,
     ) -> None:
         """Bind keys to an action.
 
@@ -117,7 +117,7 @@ def bind(
             description (str, optional): An optional description for the binding.
             show (bool, optional): A flag to say if the binding should appear in the footer.
             key_display (str | None, optional): Optional string to display in the footer for the key.
-            universal (bool, optional): Allow forwarding from the app to the focused widget.
+            priority (bool, optional): Is this a priority binding, checked form app down to focused widget?
         """
         all_keys = [key.strip() for key in keys.split(",")]
         for key in all_keys:
@@ -127,7 +127,7 @@ def bind(
                 description,
                 show=show,
                 key_display=key_display,
-                universal=universal,
+                priority=priority,
             )
 
     def get_key(self, key: str) -> Binding: