including support for separated disconnect reasons and disconnect screen messages (closes#4512)
While the refactoring of kick reason -> kick flag wasn't exactly in my agenda, I realized that these changes would become pretty confusing and inconsistent with other events if they weren't refactored.
Hopefully I don't have to break this API again for a while...
this allows localizing disconnection screens (at least, once #4512 has been addressed) and the disconnect reasons shown on the console.
We already had disconnect messages implicitly localized in a few places, so this is just formalizing it.
This does break BC with any code that previously passed translation keys as the disconnect screen message, because they'll no longer be translated (only Translatables will be translatated now).
this makes translation usage much more statically analysable.
The only places this isn't used are:
- places that prefix translations with colours (those are still a problem)
- places where server/client translations don't match (e.g. gameMode.changed accepts different parameters in vanilla than in PM)
This brings a significant performance improvement to login sequence handling, reducing CPU cost of `PrepareEncryptionTask` by over 90% and `ProcessLoginTask` by over 60%. It also allows us to shed a dependency.
SingletonTrait is pointless here for multiple reasons:
1) the class is final
2) this is protocol-specific translation of types, no loss of data or alternative mutation of it needs to occur
Using SingletonTrait is an obstacle to separating the protocol library from the core code, so it has to go.
previously this might just return false and blow up in your face.
I considered fixing this on stable too, but it's less useful there because so much stuff on stable just explodes at the first wrong thing anyway.
