update structures; fix some minor compile warnings

library/modules/Persistence.cpp

@@ -81,7 +81,7 @@ struct Persistence::LegacyData
         }
         json["i"] = std::move(ints);
 
-        return std::move(json);
+        return json;
     }
 };
 

library/xml

@@ -1 +1 @@
-Subproject commit b1045ecf01ecc710d6e815025f8f95c821b04e55
+Subproject commit 6a25d792c2482f36ff53347346f0689d9c4b47b2

plugins/cxxrandom.cpp

@@ -160,14 +160,10 @@ public:
     }
     void Print()
     {
-        char buffer1[256] = {0};
-        char buffer2[256] = {0};
         for( auto v : m_numbers )
         {
-            sprintf( buffer2, "%s%" PRId64, buffer1, v );
-            sprintf( buffer1, "%s ", buffer2 );
+            cout->print( "%" PRId64 " ", v );
         }
-        cout->print( "%s", buffer1 );
     }
 };