Remove spammy debug logging
sql: Rewrite SQLConnection, do minor cleanup

- SQLConnection does less wrapping of operations, instead being a light
  wrapper around JDBC to maintain connection and provide utility for
  existing queries
- Performance improvements by using batched queries for setPermissions
  and importing data. Still not ideal but this should help servers with
  lots of permissions
- Instead of setting default configuration using deploy file, use Java
  API. Also add config option 'deploy' which can be set to a dump file
  which will be executed on the SQL database instead of the normal default
  data. This makes things a bit easier for server admins switching from
  file to SQL backend
Only instantiate RegexPermissions in the plugin's onEnable