Using values instead of pointers makes the handling much easier. We can
remove ColumnDefinition too, and use SqliteColumn instead.
Change-Id: I224db9cc569c4dfb6e2746179b02096904bfbccb
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
We don't need the threading anymore, so we removed it. The indexer
will be run in its thread anyway, so an extra thread makes the code
only more complicated. And we added namespaces.
Change-Id: Ibcba306324763285cf653c28bb08122345e5f8da
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
