Desktop: Isolate CEF-rendered UI into separate crate and process (#4321)

* Extract CEF rendered UI into a separate process and crate

* Review

* Review

* Review

* Review

* Remove necessary workarounds

* Block on frame copy ack

* Crop and resample frames correctly

* Skip blank frames

* Fix deps

* Fix fmt

* Fix clippy warning

* Review

* Fix todo

desktop/ui/src/utility.rs

@@ -0,0 +1,6 @@
+pub unsafe fn pointer_to_string(pointer: *mut cef::sys::_cef_string_utf16_t) -> String {
+	let str = unsafe { (*pointer).str_ };
+	let len = unsafe { (*pointer).length };
+	let slice = unsafe { std::slice::from_raw_parts(str, len) };
+	String::from_utf16(slice).unwrap()
+}