Regardless of the configuration of the help desk registration, allow users
to receive ticket links via email. This patch enables the display and
operation of the ticket access link unless a user login is requested by the
user or specifically required by the system.

This adds a feature for remote authentication methods for clients, such as
LDAP, which will, after successful authentication, yield a
ClientCreateRequest rather than an AuthenticatedUser. The
ClientCreateRequest represents a successful authentication and user
information lookup for a remote client. The client is then presented with a
registration page where their information for their account in the local
system can be reviewed prior to the account creation. Once created, the
client account is confirmed without an email confirmation and is logged in
immediately without reentering a password.

This is the mode of the system if account registration is disabled

Instead of always showing the tickets page

Ticket owner as well as collaborators can request access link by entering
email and ticket number.

Administrators are allowed to upload one or more logos and then select from
the uploaded logos to set one for the client site. Logos can also be deleted
on settings->pages submission

Use the improved login function
Redirect to ticket view on successfull login.

change tryLogin to simply login

And correct several undefined function errors from several source files. So
while function names in PHP are considered case-insensitive, it still makes
sense to use consistent camel casing for both defining and calling methods.
The lint test searches the code base for method calls, and then searches the
code base again looking for a function definition matching the name of the
function invoked. It's not failsafe, because it doesn't detect the class
from which the method should belong, so it's likely to have false negatives.
Furthermore, it won't work well for PHP 5 where several classes are built
into PHP (and aren't searchable in the osTicket code base).

Remove the include/staff/api.inc.php as it no longer appears to be used (and
contains references to undefined methods).