Add list marker styles, reversed, value, ::marker and the list-item counter, and draw quotation marks for <q> #611

Part of #552 (step 28, missing support, medium priority).

List markers and quotation marks cover only part of CSS:

• list-style-type knows about 30 values. The rest (decimal-leading-zero, upper-greek, armenian, georgian, hiragana, katakana, disclosure-open and string markers such as "→ ") fall back to decimal.
• <ol reversed> and <li value> are ignored.
• ::marker rules are dropped.
• The list counter cannot be set from CSS, because counter-reset and counter-increment are never read.
• <q> draws no quotation marks, and quotes is never read.

Legal documents, contracts and numbered clauses use these.

Measured on gravitypdf at 60b82630, PHP 8.5.4, from the text handed to Cell().

Cause.

• NormalizeProperties::processListStyleProperty() finds the type by searching the value for one of a fixed list of names (src/Css/NormalizeProperties.php:1021), so decimal-leading-zero is read as decimal.
• _getStyledNumber() (src/Mpdf.php:12837) formats the numbers, and _setListMarker() (:16490) builds the marker.
• BlockTag reads <ol start> (src/Tag/BlockTag.php:146-147, :952-953) and nothing else from the list or item.
• Selectors with a pseudo-element are dropped (A descendant rule with a part mPDF cannot match is applied to the element its first parts name #521).
• Q is an empty InlineTag (src/Tag/Q.php).

Fix.

• List types.
  • Add decimal-leading-zero, upper-greek, armenian, georgian, hiragana, katakana, hiragana-iroha, katakana-iroha, lower-armenian, disclosure-open and disclosure-closed to _getStyledNumber() and the marker code. Each is a short table or a fixed algorithm from CSS Counter Styles.
  • Accept a string as a marker.
  • Match the type as a whole keyword, not a substring.
• List attributes. <ol reversed> counts down from the number of items; with start, from start. <li value> sets the counter for that item and the ones after it.
• Counters. Read counter-reset, counter-set and counter-increment for the list-item counter only, which is what <ol start>, reversed and value map onto. Named counters need generated content (::before, ::after), which Support more CSS selectors and apply CSS rules by specificity #520 lists as not planned.
• ::marker. Match li::marker (and ::marker after any list-item selector) as a pseudo-element of the item. Apply color, the font-* properties and content (a string) to the marker only.
• Quotes.
  • <q> draws an opening and a closing quote from quotes (inherited), nesting to the next pair for a <q> inside a <q>.
  • Without quotes, use the pair for the element's lang, as browsers do: “ ” and ‘ ’ in English, « » in French, „ “ in German, and so on.
  • The marks are real characters in the text, so they are copied and read aloud, and the PDF/UA tagging has to include them.

Tests. Each row above, a list in a table cell, an rtl list with upper-greek, reversed with start, ::marker on a nested list, nested <q> in English and German, and quotes: none.