Deprecate avoid in favor of null

[cyyynthia]

Following an observation of a global trend of this set being used in unintended ways, I'm planning on deprecating the Avoid pronouns, use my name meta-set and replace it with the Nullpronominal terminology.

The previous wording was used by people against pronouns as a way to mark themselves as not taking part of the thing. This is not what was intended and it does harm people who go by this identity. By shifting to a more specific term, it does close this loophole and hopefully will make people refrain from using the platform this way.

It originally was worded using the long way to be clear even to people not introduced to the concept of pronouns. Considering I want to add tooltips to most platforms to give more info, and the low use of this set (~1%), once tooltips land the current way of describing this will be in the tooltip, with the representation becoming nullpronominal (short: null).