Issue #2799603 by Mukeysh, josephdpurcell, Mixologic: .csslintrc file format is invalid and results in "important is not a valid option"

.csslintrc

@@ -1,37 +1,40 @@
-{
-  "important": true,
-  "adjoining-classes": false,
-  "known-properties": true,
-  "box-sizing": false,
-  "box-model": true,
-  "overqualified-elements": true,
-  "display-property-grouping": true,
-  "bulletproof-font-face": false,
-  "compatible-vendor-prefixes": false,
-  "regex-selectors": false,
-  "errors": false,
-  "duplicate-background-images": true,
-  "duplicate-properties": true,
-  "empty-rules": true,
-  "selector-max-approaching": false,
-  "gradients": false,
-  "fallback-colors": false,
-  "font-sizes": false,
-  "font-faces": false,
-  "floats": false,
-  "star-property-hack": true,
-  "outline-none": true,
-  "import": true,
-  "ids": true,
-  "underscore-property-hack": true,
-  "rules-count": false,
-  "qualified-headings": true,
-  "selector-max": false,
-  "shorthand": true,
-  "text-indent": true,
-  "unique-headings": true,
-  "universal-selector": false,
-  "unqualified-attributes": true,
-  "vendor-prefix": true,
-  "zero-units": true
-}
+--errors=box-model,
+         display-property-grouping,
+         duplicate-background-images,
+         duplicate-properties,
+         empty-rules,
+         ids,
+         import,
+         important,
+         known-properties,
+         outline-none,
+         overqualified-elements,
+         qualified-headings,
+         shorthand,
+         star-property-hack,
+         text-indent,
+         underscore-property-hack,
+         unique-headings,
+         unqualified-attributes,
+         vendor-prefix,
+         zero-units
+--ignore=adjoining-classes,
+         box-sizing,
+         bulletproof-font-face,
+         compatible-vendor-prefixes,
+         errors,
+         fallback-colors,
+         floats,
+         font-faces,
+         font-sizes,
+         gradients,
+         import-ie-limit,
+         order-alphabetical,
+         regex-selectors,
+         rules-count,
+         selector-max,
+         selector-max-approaching,
+         selector-newline,
+         universal-selector
+--exclude-list=core/assets,
+               vendor