added attributes to common package

[WalterBright]

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[dlang-bot]

Thanks for your pull request, @WalterBright!

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dub run digger -- build "master + dmd#15520"

[dkorpel]

Functions that take a null terminated string don't have a safe interface and can't be @trusted

[WalterBright]

@dkorpel true, but the functions are so entangled up the most reasonable path forward is to make everything @trusted and then one can work on the functions one by one to make them @safe.

[dkorpel]

You can still mark the caller of a function with an unsafe interface @trusted, there's no need to wrongly mark leaf functions @trusted since they don't untangle a circular dependency. Instead, that will only result in callers being @safe on false premises.

On a more general note, you started the "bulk mark everything @trusted and work back from there" approach in the backend, so far with little success: it's stuck in the @trusted phase without much resulting @safe from it. Therefore I'm not yet convinced this is the most reasonable path forward.