Mark single-argument constructors "explicit"

src/qt/addresstablemodel.cpp

@@ -71,7 +71,7 @@ public:
     QList<AddressTableEntry> cachedAddressTable;
     AddressTableModel *parent;
 
-    AddressTablePriv(AddressTableModel *_parent):
+    explicit AddressTablePriv(AddressTableModel *_parent):
         parent(_parent) {}
 
     void refreshAddressTable(interfaces::Wallet& wallet)

src/qt/rpcconsole.cpp

@@ -82,7 +82,7 @@ class RPCExecutor : public QObject
 {
     Q_OBJECT
 public:
-    RPCExecutor(interfaces::Node& node) : m_node(node) {}
+    explicit RPCExecutor(interfaces::Node& node) : m_node(node) {}
 
 public Q_SLOTS:
     void request(const QString &command, const QString &walletID);

src/qt/transactiontablemodel.cpp

@@ -58,7 +58,7 @@ struct TxLessThan
 class TransactionTablePriv
 {
 public:
-    TransactionTablePriv(TransactionTableModel *_parent) :
+    explicit TransactionTablePriv(TransactionTableModel *_parent) :
         parent(_parent)
     {
     }