PostCSS Preprocessing

• This release adds PostCSS for processing the CSS templates. You can check the following plugins, that are used by default, for the features that are supported:
  • Autoprefixer
  • postcss-nested
  • CSSNano
    In the future, solid-styled can possibly allow to load the PostCSS config and to allow other plugins to be used.
• Fix use:solid-styled type to be in JSX.IntrinsicAttributes