Isolate XCNewEditor default build from ImGui headers

new_editor/src/Application.h

@@ -3,12 +3,6 @@
 #include <XCEngine/Input/InputTypes.h>
 
 #include "XCUIBackend/XCUIEditorCommandRouter.h"
-#include "panels/XCUIDemoPanel.h"
-#include "panels/XCUILayoutLabPanel.h"
-
-#include "Platform/D3D12WindowRenderer.h"
-#include "Rendering/MainWindowNativeBackdropRenderer.h"
-#include "XCUIBackend/IWindowUICompositor.h"
 #include "XCUIBackend/NativeXCUIPanelCanvasHost.h"
 #include "XCUIBackend/XCUIDemoRuntime.h"
 #include "XCUIBackend/XCUIHostedPreviewPresenter.h"
@@ -17,6 +11,9 @@
 #include "XCUIBackend/XCUIRHIRenderBackend.h"
 #include "XCUIBackend/XCUIShellChromeState.h"
 #include "XCUIBackend/XCUIStandaloneTextAtlasProvider.h"
+#include "XCUIBackend/UITextureRegistration.h"
+#include "Platform/D3D12WindowRenderer.h"
+#include "Rendering/MainWindowNativeBackdropRenderer.h"
 
 #include <chrono>
 #include <cstdint>
@@ -29,10 +26,24 @@
 #include <windows.h>
 
 namespace XCEngine {
+namespace Editor {
+namespace XCUIBackend {
+
+class IWindowUICompositor;
+
+} // namespace XCUIBackend
+} // namespace Editor
+
 namespace NewEditor {
 
+class XCUIDemoPanel;
+class XCUILayoutLabPanel;
+
 class Application {
 public:
+    Application();
+    ~Application();
+
     using ShellChromeState = ::XCEngine::Editor::XCUIBackend::XCUIShellChromeState;
     using ShellPanelId = ::XCEngine::Editor::XCUIBackend::XCUIShellPanelId;
     using ShellViewToggleId = ::XCEngine::Editor::XCUIBackend::XCUIShellViewToggleId;
@@ -416,6 +427,7 @@ private:
         HostedPreviewOffscreenSurface& previewSurface,
         const ::XCEngine::Rendering::RenderContext& renderContext,
         const ::XCEngine::UI::UIDrawData& drawData);
+    void ResetLegacyPanels();
     void ConfigureShellCommandRouter();
     ::XCEngine::Editor::XCUIBackend::XCUIInputBridgeFrameDelta DispatchShellShortcuts(
         const ::XCEngine::Editor::XCUIBackend::XCUIInputBridgeFrameSnapshot& snapshot);