Added new classes to manage loadouts instead of the hashmap method.
Add new loadout class support to the existing loadout subsystem.
Add support for new loadout system to base classes and configuration
subsystem.
Closes gh-617, gh-609, gh-514, gh-319, tag gh-589. Add support for
permission specific loadouts.

Loadouts can be defined with a permission which can limit who can access
the loadout, in mostly the same manner as I did in the zone-permissions
commits. The permission can be used to only allow say VIP and above to get
a certain loadout (for donation benefits) or to allow the server's lower
ranks a class only (to allow lower ranks to survive faced with the server's
experienced players).

This is controlled by an additional argument to /zonecfg.
Example: /zonecfg loadout:vip:server.ranks.VIP - allow only VIP players
access to the vip loadout.
To remove the permission, re-make the loadout without the permission
parameter.
Example: /zonecfg loadout:vip - remove the permission requirement for the
vip loadout.

To allow a lower rank access to a loadout only, you can use your permission
manager's feature of negating a permission (if supported by the plugin).
Example: /pex group recruit add server.loadout.noob, /pex group builder add
-server.loadout.noob - allow only recruits to have access to a loadout
which requires the permission "server.loadout.noob" (with PermissionsEX).