KuiMount

* add "mount: use previous" binding to use the previously selected mount again (macro-able with /click KuiMountSecureButton UsePrevious)
* add "Kui Mount" button to open the legacy interface to the mount journal
* add hold ALT to use an aquatic mount while swimming in any zone
* add support for non-flyable zones on non-english clients
* fix spell IDs entered into lists are ignored until the list is edited again
* fix attempts to use a flying mount in certain zones even if a flying skill isn't known
* cat form is no longer supported
* vashj'ir no longer has special treatment as a swim-only zone