Fix/remove unknown props (#5372)

* improvement: OAS3 $ref friendly-name regex in model.jsx (via #5334)

* improvement: relax schema description styling so Markdown can be effective (via #5340)

* improvement: add `isShown` check to <ModelCollapse />'s prop `expanded` logic (via #5331)

* security: CVE-2018-20834 (via #5368)

* bump minimum `bundlesize` version

* bump `node-sass`

* bump webpack + webpack-dev-server; update lockfile

* release: v3.22.2

* Filter unknown props from being applied to native button (React Warning)

* Filter props without lodash

src/core/components/layout-utils.jsx

@@ -118,13 +118,15 @@ export class Button extends React.Component {
     mod: "primary"
   }
 
-  defaultClasses = () => !this.props.unstyled ? `sui-btn sui-btn--${this.props.mod}` : ""
+  defaultClasses = ({ unstyled, mod }) => !unstyled ? `sui-btn sui-btn--${mod}` : ""
 
   render() {
+    const { unstyled, mod, className, ...props } = this.props
+
     return (
       <button
-        {...this.props}
-        className={xclass(this.props.className, this.defaultClasses())}    
+        {...props}
+        className={xclass(className, this.defaultClasses({ unstyled, mod }))}    
       />
     )
   }