Implement basic desktop app with chromium embeded framework (#2874)

* Remove tauri based desktop app

* Allow bzip-1.0.6 license

* Implement basic cef based desktop app

* Cleanup build setup

* Use wait until and execute cef loop more frequently

* Remove custom do browser work event

* Move WinitApp into its own module

* Cleanup event handling

* Cleanup + Scheudule cef message loop work

* Fix cpu overheating on idle: https://xkcd.com/1172/

* Use tracing crate for logging instead of println

* Rebase to main

---------

Co-authored-by: Dennis Kobert <dennis@kobert.dev>

desktop/src/cef/internal/non_browser_app.rs

@@ -0,0 +1,47 @@
+use cef::rc::{Rc, RcImpl};
+use cef::sys::{_cef_app_t, cef_base_ref_counted_t};
+use cef::{App, ImplApp, SchemeRegistrar, WrapApp};
+
+use crate::cef::scheme_handler::GraphiteSchemeHandlerFactory;
+
+pub(crate) struct NonBrowserAppImpl {
+	object: *mut RcImpl<_cef_app_t, Self>,
+}
+impl NonBrowserAppImpl {
+	pub(crate) fn app() -> App {
+		App::new(Self { object: std::ptr::null_mut() })
+	}
+}
+
+impl ImplApp for NonBrowserAppImpl {
+	fn on_register_custom_schemes(&self, registrar: Option<&mut SchemeRegistrar>) {
+		GraphiteSchemeHandlerFactory::register_schemes(registrar);
+	}
+
+	fn get_raw(&self) -> *mut _cef_app_t {
+		self.object.cast()
+	}
+}
+
+impl Clone for NonBrowserAppImpl {
+	fn clone(&self) -> Self {
+		unsafe {
+			let rc_impl = &mut *self.object;
+			rc_impl.interface.add_ref();
+		}
+		Self { object: self.object }
+	}
+}
+impl Rc for NonBrowserAppImpl {
+	fn as_base(&self) -> &cef_base_ref_counted_t {
+		unsafe {
+			let base = &*self.object;
+			std::mem::transmute(&base.cef_object)
+		}
+	}
+}
+impl WrapApp for NonBrowserAppImpl {
+	fn wrap_rc(&mut self, object: *mut RcImpl<_cef_app_t, Self>) {
+		self.object = object;
+	}
+}