Sqlite: Improve Sqlite wrapper

It is now possible to read values at once.

for (auto [name, value] : statement.tupleValues<String, int>(1000, "foo", 20))
   ....

Change-Id: I3d4bc5218810b4620e1df625126aa490f30bbc71
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/unit/unittest/sqlitetable-test.cpp

@@ -32,6 +32,9 @@
 
 namespace {
 
+using Sqlite::ColumnType;
+using Sqlite::JournalMode;
+using Sqlite::OpenMode;
 using Sqlite::SqliteColumn;
 using Sqlite::SqliteDatabase;