feat(wayland): Window::SetAppId

xdg_toplevel.set_app_id, so the compositor can match the window to its
.desktop file: the icon, the task switcher, activation.

implementations/Crafter.Graphics-Window.cpp

@@ -620,6 +620,12 @@ void Window::SetTitle(const std::string_view title) {
     #endif
 }
 
+void Window::SetAppId(const std::string_view id) {
+    #ifdef CRAFTER_GRAPHICS_WINDOW_WAYLAND
+    xdg_toplevel_set_app_id(xdgToplevel, std::string(id).c_str());
+    #endif
+}
+
 void Window::SetTextInput(bool active, std::int32_t x, std::int32_t y, std::int32_t width, std::int32_t height, TextInputPurpose purpose) {
     #ifdef CRAFTER_GRAPHICS_WINDOW_WAYLAND
     textInputActive_ = active;