add force rankup and prestige
add update notification on join
more reliable legacy server version check
added permissions: rankup.admin (grants rankup.checkversion, rankup.reload, rankup.force, and rankup.notify), rankup.notify (receive update notiifications on login), rankup.force (force a player to rankup or prestige)
- add messages in /rank and /rankup for when the configuration has a rankup to a non-existent rank.
- add invalid rankup message
- fix error for placeholders when prestiging is disabled
- add message for when a rank has no requirements
improve operations and make them extendable more easily and let other plugins add operations, like requirements
move requirements/operations out of ranks class as they will be used in prestiges