create-demo-win-zip - create a 7z with the example execs

Add a "createZipDemo" buildsystem target to run this.
The 7z includes the Qt runtime.

deploy/create-demo-win-zip.bat

@@ -0,0 +1,47 @@
+@echo off
+rem
+rem This file is part of KDDockWidgets.
+rem
+rem SPDX-FileCopyrightText: 2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+rem
+rem SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+rem
+rem Contact KDAB at <info@kdab.com> for commercial licensing options.
+rem
+
+rem assumes the builddir is the workdir
+rem assumes Qt is in PATH
+rem %1 is the name of the deployment
+
+if [%1] == [] (
+  echo "Usage: %~nx0 <deploymentName>"
+  goto theEnd
+)
+
+rem Prepare the deployDir
+set "deploy=%1"
+if exist %deploy% (
+  rmdir /Q /S %deploy%
+)
+mkdir %deploy%
+
+rem Deploy programs
+for %%s in (bin\*.dll bin\*_example.exe) do (
+    copy %%s %deploy% >nul
+)
+
+rem Deploy Qt
+windeployqt --compiler-runtime %deploy%
+
+rem Zip it
+set zipFile=%cd%\%deploy%.7z
+if exist %zipFile% (
+  del /F /Q %zipFile%
+)
+7z a %zipFile% %deploy%
+
+rem Must echo this line exactly for the CI
+echo Created zip file "%zipFile%" successfully
+
+:theEnd
+exit /b %ERRORLEVEL%