Compat with Ctrl while on other keyboard layouts

When using a different layout other than qwerty some Ctrl commands may
be interpreted as the hardware key it is usually tied to. This is worked
by working on "key" and "char" callback on glfw, where "key" is the
hardware key and "char" is the layout-translated actual key.
This key can be gathered by using (taken from glfw tests/events.c)
```c
glfwGetKeyName(key, scancode)
```

kitty/boss.py

@@ -254,7 +254,7 @@ def on_text_input(self, window, codepoint, mods):
                 w.write_to_child(data)
 
     @callback
-    def on_key(self, window, key, scancode, action, mods):
+    def on_key(self, window, key, scancode, action, mods, name):
         is_key_pressed[key] = action == GLFW_PRESS
         self.start_cursor_blink()
         self.cursor_blink_zero_time = monotonic()
@@ -281,7 +281,13 @@ def on_key(self, window, key, scancode, action, mods):
                 if window.screen.auto_repeat_enabled or action == GLFW_PRESS:
                     if window.char_grid.scrolled_by and key not in MODIFIER_KEYS:
                         window.scroll_end()
-                    data = interpret_key_event(key, scancode, mods)
+                    # name variable comes with effective casing but the control codes
+                    # are set towards strictly upppercase letters, so we uppercase them:
+                    data = None
+                    if name is not None:
+                        data = interpret_key_event(ord(name.upper()), scancode, mods, name)
+                    else:
+                        data = interpret_key_event(key, scancode, mods, name)
                     if data:
                         window.write_to_child(data)
 

kitty/glfw.c

@@ -59,7 +59,7 @@ char_mods_callback(GLFWwindow *w, unsigned int codepoint, int mods) {
 
 static void 
 key_callback(GLFWwindow *w, int key, int scancode, int action, int mods) {
-    WINDOW_CALLBACK(key_callback, "iiii", key, scancode, action, mods);
+    WINDOW_CALLBACK(key_callback, "iiiis", key, scancode, action, mods, glfwGetKeyName(key, scancode));
 }
 
 static void 

kitty/keys.py

@@ -48,7 +48,7 @@
 alt_codes = {k: (0x1b, k) for i, k in enumerate(range(defines.GLFW_KEY_SPACE, defines.GLFW_KEY_RIGHT_BRACKET + 1))}
 
 
-def interpret_key_event(key, scancode, mods):
+def interpret_key_event(key, scancode, mods, name):
     data = bytearray()
     if mods == defines.GLFW_MOD_CONTROL and key in control_codes:
         # Map Ctrl-key to ascii control code