Eliminate dependency on ORMLite

[ornamental]

The ORM functionality is not employed at all as only raw SQL queries are sent to SQLite. Thus there is no need in using ORMLite, JDBC functionality combined with connection pooling should be sufficient.

1. Implement JDBC connection pooling.
2. Consider preparing certain statements on per-connection basis (as there will be only one RW connection, the INSERT, UPDATE, and DELETE statements only have to be prepared for this connection; RO queries will have to be prepared for each connection in the pool).
3. Migrate to the new querying mechanism and exclude the dependencies which will become redundant.