This removes the map of attachments in ArenaImpl and makes the permissions "replacement" happen via the Bukkit API's PermissionAttachmentInfo. Bukkit already keeps track of which attachments we've added to a player, so removing them is just a matter of looping through and finding those. This reduces the coupling between the Arena interface and UpgradeWave (which is the only interface that used the methods removed from the Arena interface).
MobArena

MobArena is an arena-style minigame for Spigot-based Minecraft servers
Getting Started
If you don't want to compile the plugin yourself, grab a release artifact from one of these two sites:
The wiki here on Github should have all the information you need to get started using the plugin.
Getting Help
If you run into problems or need help with something, feel free to hop on the MobArena Discord server or IRC channel to have a chat:
- Discord: Instant Invite
- IRC (#mobarena @ EsperNet): KiwiIRC Web Client
Remember, though, that these communication channels are idle chat, which means you likely won't get a response immediately. It could take anything from a couple of seconds to a day, but your message will be seen.
Contributing
Found a bug, got a suggestion, or want to dig into the code base? There are many ways to contribute to the project!
Get started here: Contributing