NewFrame: Extract some code into a NewFrameUpdateHoveredWindowAndCaptureFlags() which can be of use with touch-based inputs systems.

imgui_internal.h

@@ -1017,6 +1017,8 @@ namespace ImGui
     IMGUI_API void          Initialize(ImGuiContext* context);
     IMGUI_API void          Shutdown(ImGuiContext* context);    // Since 1.60 this is a _private_ function. You can call DestroyContext() to destroy the context created by CreateContext().
 
+    IMGUI_API void          NewFrameUpdateHoveredWindowAndCaptureFlags();
+
     IMGUI_API void                  MarkIniSettingsDirty();
     IMGUI_API ImGuiSettingsHandler* FindSettingsHandler(const char* type_name);
     IMGUI_API ImGuiWindowSettings*  FindWindowSettings(ImGuiID id);