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/ZXingCpp.cpp

@@ -0,0 +1,18 @@
+/*
+* Copyright 2024 Axel Waggershauser
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#include "ZXingCpp.h"
+
+#include "Version.h"
+
+namespace ZXing {
+
+const std::string& Version()
+{
+	static std::string res = ZXING_VERSION_STR;
+	return res;
+}
+
+} // namespace ZXing