Add support for SSL certificates in the MySQL connection

Convert to desired charset when getting email parts.

 - get_path_info() - simply returns the PATH_INFO if available
 - get_var() - get var from an array - checks if index is set & can validate type.

Add tickets count to ticket's status filter dropdown.

Remove SLA when overdue flag is cleared AND est. duedate is in the past. Only managers can manually clear overdue tickets.

Make sure ticket api controller enforces attachments settings (don't trust data parsers).

Change /api/task/* -> /api/tasks/*

Fix minor spacing/formatting issues.

Don't show reply/response section on new ticket form if the staff can NOT post replies... also checked in Ticket::open().

Add method to sanitize rich/html text. Addd html encode/decode methods. Remove html encode on display (encoded text saved in db)

Fully implement thread entry class and types (Note, Message & Response)

Show assigned to column based on flag - which now factors in if assigned tickets are being shown on open queue.

 -> Open - only contains unasssined tickets if 'show assigned tickets' is off.