79 line numbers css issues

[sidkshatriya]

See #79

(These changes must go with changes to the changes to the lullabot fork https://github.com/Lullabot/PHP-CSS-Parser )

[sidkshatriya]

This is already working quite well ( compare with #78 (comment) ). See the line numbers outputted for CSS (we didn't have this capability before). Note: Requires custom version of sabberworm/php-css-parser

AMP-HTML Validation Issues and Fixes
-------------------------------------
FAIL

<style amp-custom> on line 27
- The text (CDATA) inside tag 'style amp-custom' contains 'CSS -amp- class name prefix', which is disallowed.
   [code: CDATA_VIOLATES_BLACKLIST  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]
- The text (CDATA) inside tag 'style amp-custom' contains 'CSS !important', which is disallowed.
   [code: CDATA_VIOLATES_BLACKLIST  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

<style amp-custom> on line 29
- CSS syntax error in tag 'style amp-custom' - saw invalid at rule '@import'.
   [code: CSS_SYNTAX_INVALID_AT_RULE  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

<style amp-custom> on line 33
- CSS syntax error in tag 'style amp-custom' - saw invalid at rule '@viewport'.
   [code: CSS_SYNTAX_INVALID_AT_RULE  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

<style amp-custom> on line 39
- CSS syntax error in tag 'style amp-custom' - invalid url protocol 'invalid:'.
   [code: CSS_SYNTAX_INVALID_URL_PROTOCOL  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

<style amp-custom> on line 48
- CSS syntax error in tag 'style amp-custom' - invalid url protocol 'invalid:'.
   [code: CSS_SYNTAX_INVALID_URL_PROTOCOL  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

<style amp-custom> on line 51
- CSS syntax error in tag 'style amp-custom' - invalid url protocol 'absolute:'.
   [code: CSS_SYNTAX_INVALID_URL_PROTOCOL  category: AUTHOR_STYLESHEET_PROBLEM see: https://www.ampproject.org/docs/reference/spec.html#stylesheets]

[sidkshatriya]

This branch has not been merged yet -- merged the latest master branch and made updates to composer.json to keep things upto date.

[sidkshatriya]

This was merged to master. It uses the latest version ^8.0.0 of the sabberworm css parser which contains our patch for line numbers