Refactor new_editor window architecture and routing

new_editor/app/UtilityWindows/EditorUtilityWindowKind.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include <cstdint>
+
+namespace XCEngine::UI::Editor::App {
+
+enum class EditorUtilityWindowKind : std::uint8_t {
+    None = 0,
+    ColorPicker,
+    AddComponent,
+};
+
+} // namespace XCEngine::UI::Editor::App