[feature/session-storage] Turn some db access in session into storage calls

PHPBB3-9733
[feature/session-storage] Add session storage object to session constructor

PHPBB3-9733
[feature/session-storage] Modified database calls to fix errors

Fixed: (1) minor sql error 's.*' -> '*'
           (2) false should be casted to int to be 0
           (3) fetch_field should be fetch row to match old session code

PHPBB3-9733
[feature/session-storage] Cleaned up functions in native, added calls

PHPBB3-9733
[feature/session-storage] Add more session storage calls

PHPBB3-9733
[feature/session-storage] Add 2 remove and 1 map session storage calls

PHPBB3-9733
[feature/session-storage] Fix user.php to use session storage properly

PHPBB3-9733
[feature/session-storage] Set db later to session storage

PHPBB3-9733
[feature/session-storage] Changes to session.php

PHPBB3-9733
[feature/session-storage] Cleanup native.php for coding guidelines consistency

PHPBB3-9733
[feature/session-storage] Eliminate storage method redundancies

PHPBB3-9733
[feature/session-storage] Added an interface for session storage with documentation

PHPBB3-9733
[feature/session-storage] Fixed a mysql error caused by missing parenthesis

PHPBB3-9733
[feature/session-storage] Move files to match new directory structure

PHPBB3-9733
[feature/session-storage] Move files to match new directory structure

PHPBB3-9733
[feature/session-storage] Change paths in test to match new directory structure

PHPBB3-9733
[feature/session-storage] Change paths in test to match new directory structure

PHPBB3-9733
[feature/session-storage] Pass in args, $user_id cast as integers, change quote style.

PHPBB3-9733