This commit adds a delayed check for whether the block at the sign change event's location is still a sign. If it isn't, it's assumed that a plugin blocked the sign creation by destroying the sign. In this case, the player is immediately refunded, even if refunds are disabled.
Previously, if a tracked sign was removed during loading, while it wasn't added to tracked signs, tracked signs wasn't saved, so on the next startup it would be loaded again.
Makes sure that the paid sign matching the most conditions is always chosen as the matching paid sign
Makes sure to always choose the most expensive paid sign if two or more paid signs with the same amount of conditions are matching.
Changes some classes to records to reduce some boilerplate code
Changes some warning messages to info
Displays sign creation cost when unable to create a paid sign
Changes spigot dependency to 1.19
Refunds the player during reload/startup when a tracked sign's physical sign has been destroyed
