Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Proxies/Buildings/BuildingControlUnit/bcu_xml_reader.h

@@ -0,0 +1,36 @@
+
+
+
+#pragma once
+
+#include "bcu_types.h"
+#include <BuildingControlUnit/buildingcontrolcommon_export.h>
+
+class QDomElement;
+
+namespace BuildingControlUnit
+{
+class XmlReaderException : public std::exception
+{
+public:
+  explicit XmlReaderException(const QString &msg) noexcept
+    : m_msg(msg.toUtf8())
+  {}
+
+  ~XmlReaderException() = default;
+
+  virtual const char *what() const noexcept
+  {
+    return m_msg.data();
+  }
+private:
+  QByteArray m_msg;
+};
+
+BUILDINGCONTROLCOMMON_EXPORT QDomElement readFile(const QString &fn, const QString &rootTag);
+BUILDINGCONTROLCOMMON_EXPORT bool hasTagText(const QDomElement &element, const QString &tagName);
+BUILDINGCONTROLCOMMON_EXPORT QString getTagText(const QDomElement &element, const QString &tagName, bool bOptional = false);
+BUILDINGCONTROLCOMMON_EXPORT QString getAttribute(const QDomElement &element, const QString &attributeName, bool bOptional = false);
+BUILDINGCONTROLCOMMON_EXPORT bool parseBuildingConfigXml(const QString &fn, BuildingBsmConfig &bsmCfg, BuildingEgcuConfig &egcuConfig);
+
+}