Add support for printing more information in diagnosis log

Also yacreaderlibraryserver can now print this with the --system-info option

This will help when giving support to users.

common/global_info_provider.h

@@ -0,0 +1,12 @@
+#ifndef GLOBAL_INFO_PROVIDER_H
+#define GLOBAL_INFO_PROVIDER_H
+
+#include <QString>
+
+namespace YACReader {
+
+QString getGlobalInfo();
+
+}
+
+#endif // GLOBAL_INFO_PROVIDER_H