closes#5984 refactors legacy pages, includes the following:
o remove type field as this seems to be redundant and confusing
o input form additions (show hide related fields)
o add button for carp type to select first unused vhid
o implement configure action, caching removed addresses in /tmp/delete_vip_{$uuid}.todo files (by the controller)
o add mode filter to search action and complete with relevant fields for our grid
o fix warning in interfaces.inc (interface_proxyarp_configure()), array creation issue
o add validation for addresses used in port forwards and outbound nat rules. previous version tried to rename forwards, we choose to be consistent when it comes to edit/delete.
o change ACL to use the new endpoints, remove "show only" ACL. we can always consider putting it back later, but the experience of only able to reach the grid likely won't be practical.
o remove old firewall_virtual_ip*.php files
