zxing-cpp: strip to core library only (remove tests/wrappers/examples/docs); .gitignore: fix /core to allow zxing-cpp/core/ dir

tools/chatgui/zxing-cpp/core/src/ZXVersion.h

@@ -0,0 +1,14 @@
+/*
+* Copyright 2026 Axel Waggershauser
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "Version.h"
+
+#if defined(_MSC_VER)
+#pragma message("<ZXing/ZXingVersion.h> is deprecated, include ZXing/Version.h instead")
+#else
+#warning "<ZXing/ZXingVersion.h> is deprecated, include ZXing/Version.h instead"
+#endif