idgames_db_dump: close #98; streamline database connection
project: issue #104; created Database role

- Renamed existing database object to be the database object that
  manages the 'idgames_db_dump' database
wadindex: issue #104; updated to use idGamesDB object
Roles/Database: issue #104; stripped out idGamesDB methods

- Added 'dbh' attribute, for holding a reference to the database
  handler
- Fixed POD docs
idGamesDB: issue #104; stripped out common methods

- Stripped out methods and attributes provided by Database role
- Updated all methods to pull the database handle from '$self->dbh'
- Updated POD
IndexDB: close #104; added DB object for wadindex DB