Replace all typedefs by usings

This is just a matter of code style, no functional change whatsoever.

src/sqlitedb.h

@@ -25,8 +25,8 @@ enum LogMessageType
     kLogMsg_ErrorLog
 };
 
-typedef QMultiMap<std::string, sqlb::ObjectPtr> objectMap;      // Maps from object type (table, index, view, trigger) to a pointer to the object representation
-typedef QMap<std::string, objectMap> schemaMap;                 // Maps from the schema name (main, temp, attached schemas) to the object map for that schema
+using objectMap = QMultiMap<std::string, sqlb::ObjectPtr>;      // Maps from object type (table, index, view, trigger) to a pointer to the object representation
+using schemaMap = QMap<std::string, objectMap>;                 // Maps from the schema name (main, temp, attached schemas) to the object map for that schema
 
 int collCompare(void* pArg, int sizeA, const void* sA, int sizeB, const void* sB);
 
@@ -76,7 +76,7 @@ public:
     // This returns the SQLite version as well as the SQLCipher if DB4S is compiled with encryption support
     static void getSqliteVersion(QString& sqlite, QString& sqlcipher);
 
-    typedef std::unique_ptr<sqlite3, DatabaseReleaser> db_pointer_type;
+    using db_pointer_type = std::unique_ptr<sqlite3, DatabaseReleaser>;
 
     /**
        borrow exclusive address to the currently open database, until
@@ -124,7 +124,7 @@ public:
     // callback is the text representation of the values, one for each
     // column. The 3rd argument is a list of strings where each entry
     // represents the name of corresponding result column.
-    typedef std::function<bool(int, QStringList, QStringList)> execCallback;
+    using execCallback = std::function<bool(int, QStringList, QStringList)>;
     bool executeSQL(QString statement, bool dirtyDB = true, bool logsql = true, execCallback callback = nullptr);
     bool executeMultiSQL(QByteArray query, bool dirty = true, bool log = false);
     QByteArray querySingleValueFromDb(const QString& sql, bool log = true, ChoiceOnUse choice = Ask);