this is not as good as phpstan/phpstan-src#769 (e.g. array_key_first()/array_key_last() aren't covered by this, nor is array_rand()) but it does eliminate the most infuriating cases where this usually crops up.
all remaining submodules are now non-essential to running a server.
They are also versioned and updates can be done automatically using 'composer update'.
Finally, we can also put an end to the issue of translations being rendered incorrectly or being missing due to outdated submodules.
these weren't getting corrected since php-cs-fixer 3.0 due to a change in the default configuration for native_function_invocation. Since the builds are randomly choosing to use php-cs-fixer 2.19 at the moment, the consistency is a problem.
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)
