This commit introduces a new `register()` method on the CommandHandler class to allow registering pre-instantiated subcommands. This means that subcommands are no longer restricted in terms of instantiation, so they can have their dependencies injected at creation, rather than having to resort to Singleton anti-pattern means. Also refactors the existing internal MobArena command registration to use the new method to "drink our own champagne" and to reuse the code. Fixes #675
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 to have a chat: Instant Invite
Remember, though, that this communication channel is 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