* Added a 'WEBAPI_AUTHS' table to the database.
* Added a 'USERS.WEBAPI_AUTH_TIMEOUT' field to the database.
* Incremented the database version to 260.
* Added 'RDUser::webapiAuthTimeout()' and
'RDUser::setWebapiAuthTimeout()' methods in 'lib/rduser.cpp' and
'lib/rduser.h'.
* Added a 'WebAPI Timeout' control to the Edit User dialog in
'rdadmin/edit_user.cpp' and 'rdadmin/edit_user.h'.
* Implemented a 'CreateTicket' Web API call.