Rules that were disabled initially and need to be fixed are listed below. Work will be split between @Universal_Omega and @SamanthaNguyen.
NOTE: Do **not** try to fix everything at once! One (**small**) patch at a time for a group of related rules.
[x] at-rule-empty-line-before
[x] block-closing-brace-empty-line-before
[x] block-opening-brace-newline-after
[x] block-closing-brace-newline-before
[x] block-opening-brace-newline-before
[x] block-opening-brace-space-before
[x] color-hex-case
[x] color-hex-length
[x] color-named
[x] comment-whitespace-inside
[x] declaration-colon-space-after
[] declaration-block-no-duplicate-properties
[x] declaration-block-no-redundant-longhand-properties
[x] declaration-block-semicolon-newline-after
[x] declaration-block-trailing-semicolon
[] declaration-no-important
[x] declaration-property-value-blacklist
[] declaration-property-value-disallowed-list
[] font-family-name-quotes
[] font-weight-notation
[x] function-comma-space-after
[x] function-blacklist
[x] function-parentheses-space-inside
[] function-url-quotes
[x] indentation
[x] length-zero-no-unit
[x] max-empty-lines
[x] media-feature-colon-space-after
[x] media-feature-parentheses-space-inside
[] no-descending-specificity
[] no-duplicate-selectors
[x] no-eol-whitespace
[x] no-missing-end-of-source-newline
[x] number-leading-zero
[x] rule-empty-line-before
[x] selector-attribute-brackets-space-inside
[x] selector-combinator-space-after
[x] selector-list-comma-newline-after
[x] selector-list-comma-space-after
[] selector-max-id
[x] selector-no-vendor-prefix
[x] selector-pseudo-class-parentheses-space-inside
[x] selector-pseudo-element-colon-notation
[x] string-quotes
[x] unit-blacklist
[] unit-disallowed-list
[x] value-keyword-case
[x] value-list-comma-space-after