New option to send canvas to render buffer

allows to use 3D environment effects for post processing such as Glow,
Bloom, HDR, etc. in 2D.

platform/windows/os_windows.cpp

@@ -1862,6 +1862,7 @@ String OS_Windows::get_stdin_string(bool p_block) {
 void OS_Windows::move_window_to_foreground() {
 
 	SetForegroundWindow(hWnd);
+	BringWindowToTop(hWnd);
 
 }