* fix: don't call X11 functions in file dialog and message box

* refactor: remove unused GtkUiPlatform declaration

* fix: set gtk darktheme only when running under X11

* fix: replace X11 window state watcher with implementation using ozone

* fix: make sure global menu barr is used only when supported

* fix: don't call X11 function in native window views under wayland

* style: fix lint issues

* fix: use GtkUiPlatform::ShowGtkWindow instead of gtk_window_present directly

* refactor: extract CreateGlobalMenuBar into separate function

* refactor: move checking for WaylandWindowDecorations inside class

* fix: check if we run under X11 only in ozone build

* refactor: drop including unused ui/base/ui_base_features.h header

* fix: modify ui_gtk_public_header.patch to also export gtk_ui.h

* fix: refactor guarding of X11 calls

- Introduce patch exposing new electron_can_call_x11 property
- Replace defined(USE_OZONE) with BUILDFLAG(OZONE_PLATFORM_X11) flags

* fix: remove the last remaining usage of USE_X11

* fix: usage of BUILDFLAG(OZONE_PLATFORM_X11) not building on non ozone

* fix: call UpdateWindowState from OnBoundsChanged only under X11