Added Action Bar message ActionType

[MackenzieMolloy]

This PR adds a [actionbar] <message> action type for sending messages to the player's action bar.

Tested on Paper 1.21.8.

I'll follow-up with a wiki pr to document the addition (plus missing ones like [log]) once this is confirmed for merging.

[Kqliber]

Player#sendActionBar is a paper exclusive method
Not sure we can break spigot compatibility just yet, feel free to target this into the paper-only branch and we can merge it there instead

[MackenzieMolloy]

Player#sendActionBar is a paper exclusive method Not sure we can break spigot compatibility just yet, feel free to target this into the paper-only branch and we can merge it there instead

Thanks for the heads-up, let me adjust the implementation instead to support Spigot. For the Paper branch, I suppose my change could get pulled in from main and then updated subsequently to the Paper-only method.

[MackenzieMolloy]

That's it now been swapped out to a Spigot-compatible method.

Tested on Spigot 1.16.5 and Paper 1.21.8.