Expanding language keys and adding mixed-language speech.

[MistakeNot4892]

Description of changes

This was just supposed to be the keys stuff but I kinda spiralled.

• Languages can have keys of any length.
• Language keys must be text.
• Language keys in speech must be followed by a space.
• Using a numerical key for speech will look for that language sequentially in your language list. ie. ,1 is your first known language.
• Partial keys will use the first matching language in your language list. ,h will match ,human.
• You can use a language key in the middle of a sentence to switch language.
• Rewrote holopads to handle message passing in a better/more coherent way with less code.

Why and what will this PR improve

Mixing languages in speech is good fun for RP, and the backend changes have cleaned up, centralized a fair wodge of logic.

TODO

• Rewrite holopads to handle phrases properly. Oh god oh fuck.
• Sort out why the MC is soft resetting after speech (probably a blocking loop somewhere).
• Test basic speech (no language, one language, multiple languages)
• Test basic speech over radio.
• Test basic speech over broadcast (binary).
• Test basic speech over holopad.
• Test mixed broadcast (binary) and spoken.
• Test mixed sign/nonvocal and spoken.

Issues

• Overhead text not offset high enough.
• Animal noises are not scrambled. Type understands type, intentional.
• Sign language not transmitted over holopad.
• Cannot speak plain binary (gives 'you cannot mix non-spoken and spoken' error).

Authorship

Myself.

Changelog

TBD

[MistakeNot4892]

I need to do some more exhaustive testing before merge, but I think this is good for review now.

Stale

[MistakeNot4892]

Binary radio headset does allow you to send different languages over binary, but that is a niche enough case that I don't want to fix it for this PR.

[MistakeNot4892]

Last issue is that overhead text flickers and is out of place for 1 tick immediately after creation. I have no idea why, logic looks straightforward.