Allow some strings in string-content

[fregante]

Rule: https://github.com/sindresorhus/eslint-plugin-unicorn/blob/master/docs/rules/string-content.md

Issues reported in xojs/xo#439 (comment)

I initially suggested this rule in #327 but I'm not able to use it for my original case because it applies to strings that shouldn't be changed.

I think this rule should instead be applied only in some cases, via whitelist.

An example would be:

• use variable name, e.g. const description = 'More...'
• use property name, e.g. {description: 'More...'}
• use TypeScript type, e.g. FeatureMeta['description']
• use AST like indent rule’s ignoreNodes (not sure if this is applicable)
• use JSX attributes and textContent

This would probably replace the current tag-based blacklist.

[fisker]

I think node selector is a good idea, but people might not familiar with that syntax.

[fisker]

People do use that https://github.com/search?l=JSON&q=indent+ignoredNodes&type=Code

[fregante]

people might not familiar with that syntax.
Indeed.

I use it too, but I just copy-pasted it from some GitHub issue.