Implement chat newline rewriter

[Beaness]

Fixes #500
Has been running a while in production to make sure no styling is broken, have not seen any issues yet.

[florianreuth]

Could you show a before/after + some steps to reproduce?

[Beaness]

Test commands:

/tellraw @a {"text":"First Line \n","extra":[{"text":"Bold Part ","bold":true,"extra":[{"text":"A \n B","color":"red"}]}]}
/spark health

Before:

After:

[florianreuth]

I couldn't spot any potential issues, so I'll hope for the best:tm: