infra: Make Avalonia the default UI (#6375)

* misc: Move Ryujinx project to Ryujinx.Gtk3

This breaks release CI for now but that's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* misc: Move Ryujinx.Ava project to Ryujinx

This breaks CI for now, but it's fine.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* infra: Make Avalonia the default UI

Should fix CI after the previous changes.

GTK3 isn't build by the release job anymore, only by PR CI.

This also ensure that the test-ava update package is still generated to
allow update from the old testing channel.

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix missing copy in create_app_bundle.sh

Signed-off-by: Mary Guillemard <mary@mary.zone>

* Fix syntax error

Signed-off-by: Mary Guillemard <mary@mary.zone>

---------

Signed-off-by: Mary Guillemard <mary@mary.zone>

src/Ryujinx/Common/KeyboardHotkeyState.cs

@@ -0,0 +1,16 @@
+namespace Ryujinx.Ava.Common
+{
+    public enum KeyboardHotkeyState
+    {
+        None,
+        ToggleVSync,
+        Screenshot,
+        ShowUI,
+        Pause,
+        ToggleMute,
+        ResScaleUp,
+        ResScaleDown,
+        VolumeUp,
+        VolumeDown,
+    }
+}