Drop stylistic rules for style lint v15

[fregante]

• Closes https://github.com/xojs/stylelint-config-xo/issues/19

Procedure:

1. I did a search and replace with this regex:

'(at-rule-name-case|at-rule-name-newline-after|at-rule-semicolon-space-before|at-rule-name-space-after|at-rule-semicolon-newline-after|block-closing-brace-empty-line-before|block-closing-brace-newline-after|block-closing-brace-newline-before|block-opening-brace-newline-after|block-opening-brace-space-before|color-hex-case|declaration-bang-space-after|declaration-bang-space-before|declaration-block-semicolon-newline-after|declaration-block-semicolon-newline-before|declaration-block-semicolon-space-after|declaration-block-semicolon-space-before|declaration-block-trailing-semicolon|declaration-colon-newline-after|declaration-colon-space-after|declaration-colon-space-before|function-comma-newline-after|function-comma-newline-before|function-comma-space-after|function-max-empty-lines|function-parentheses-newline-inside|function-parentheses-space-inside|function-whitespace-after|linebreaks|max-empty-lines|media-feature-colon-space-after|media-feature-colon-space-before|media-feature-name-case|media-feature-parentheses-space-inside|media-feature-range-operator-space-after|media-feature-range-operator-space-before|media-query-list-comma-newline-after|media-query-list-comma-newline-before|media-query-list-comma-space-before|no-empty-first-line|no-eol-whitespace|no-extra-semicolons|no-missing-end-of-source-newline|number-leading-zero|number-no-trailing-zeros|property-case|selector-attribute-brackets-space-inside|selector-attribute-operator-space-after|selector-attribute-operator-space-before|selector-combinator-space-after|selector-combinator-space-before|selector-descendant-combinator-no-non-space|selector-list-comma-newline-after|selector-list-comma-newline-before|selector-list-comma-space-after|selector-list-comma-space-before|selector-max-empty-lines|selector-pseudo-class-case|selector-pseudo-class-parentheses-space-inside|selector-pseudo-element-case|string-quotes|unicode-bom|unit-case|value-list-comma-newline-after|value-list-comma-newline-before|value-list-comma-space-after|value-list-comma-space-before|value-list-max-empty-lines|indentation)': [^,]+,

2. Ran another one without the ' to find non-escaped properties
3. Fixed the single options object left behind
4. Ran locally to ensure all deprecated rules were removed

[sindresorhus]

Why not just switch to https://github.com/elirasza/stylelint-stylistic? There are many useful stylistic rules like color-hex-case.

[fregante]

"Just" implies it was common knowledge that:

1. That existed
2. Prettier wasn't equivalent to the missing rules
3. Is as easy as a search and replace

Closing for now 😅