Port away from deprecated API

Makes sure it works properly with Qt 5.15

analitza/variables.h

@@ -19,6 +19,7 @@
 #ifndef VARIABLES_H
 #define VARIABLES_H
 
+#include <qobjectdefs.h>
 #include <QHash>
 
 #include "analitzaexport.h"
@@ -41,6 +42,7 @@ class Object;
 
 class ANALITZA_EXPORT Variables : public QHash<QString, Object*>
 {
+    Q_GADGET
     public:
         /** 
         *    Creates an empty variable hash table with the usual constants

analitzagui/operatorsmodel.cpp

@@ -30,10 +30,12 @@ OperatorsModel::OperatorsModel(QObject *parent) : QAbstractTableModel(parent), m
 
 QHash<int, QByteArray> OperatorsModel::roleNames() const
 {
-    return QAbstractTableModel::roleNames().unite( {
-            {IsVariableRole, "isVariable"},
-            {DescriptionRole, "description"}
+    auto ret = QAbstractTableModel::roleNames();
+    ret.insert({
+        {IsVariableRole, "isVariable"},
+        {DescriptionRole, "description"}
     });
+    return ret;
 }
 
 QVariant OperatorsModel::data(const QModelIndex & index, int role) const

analitzaplot/plotsmodel.cpp

@@ -47,7 +47,11 @@ PlotsModel::~PlotsModel()
 
 QHash<int, QByteArray> PlotsModel::roleNames() const
 {
-    return QAbstractListModel::roleNames().unite({{ DescriptionRole, "description" }});
+    auto ret = QAbstractListModel::roleNames();
+    ret.insert({
+        { DescriptionRole, "description" }
+    });
+    return ret;
 }
 
 void PlotsModel::clear()

declarative/analitzadeclarativeplugin.cpp

@@ -35,5 +35,5 @@ void AnalitzaDeclarativePlugin::registerTypes(const char* uri)
     qmlRegisterType<Analitza::PlotsModel>(uri, 1, 0, "PlotsModel");
     qmlRegisterType<Analitza::VariablesModel>(uri, 1, 0, "VariablesModel");
     qmlRegisterType<OperatorsModel>(uri, 1, 0, "OperatorsModel");
-    qmlRegisterInterface<Analitza::Variables*>("Analitza::Variables");
+    qmlRegisterInterface<Analitza::Variables>(uri, 1);
 }