Slight risk of API breakage but risk is minimal enough that I'm not bumping versions.
0.5.0 Migration guide suggested (Platform)CommandManager, which will set the generics for you.
Only if you stored the ref as the Abstract CommandManager would you now run into generic issues.
Also, cleaned up the sendMessage API's to not need Object now since we know the Generic type.
This is technically an API break, but considering Locales was only released last night and
the likelyhood someone overrode that method, is unlikey.
If you did, just fix the method signature! Sorry <3
For consistency, make Completion Handlers be implemented the same way Context Handlers are.
Previously when we added the Context parameter, we left the original signature in place and simply tacked , c on the end.
This made migration easier than changing all completion handlers bodies.
But since 0.5.0 is a big migration already, let's just get it over with.
See changes to Bukkit default completions and the example plugin for migration example.
Aikar