fix: apply rector and code sniffer fixes

add listo_open_start sibling method for GFM start numbers

Reverts the listo_open signature widening from 5a2118acc and instead
adds a sibling method `listo_open_start($start = 1)` on the renderer
hi

add listo_open_start sibling method for GFM start numbers

Reverts the listo_open signature widening from 5a2118acc and instead
adds a sibling method `listo_open_start($start = 1)` on the renderer
hierarchy. The base default delegates to listo_open() so renderers
that don't override it still produce a valid (but unnumbered) list;
xhtml's override emits <ol start="N">.

The handler now emits 'listo_open_start' only for ordered lists with
a non-default first number; plain ordered lists keep emitting the
unchanged 'listo_open' instruction. This preserves the historical
listo_open / listu_open signatures (zero-arg base, $classes-only
xhtml form from 2016) so the 17 plugin renderers found via
codesearch keep working without modification, while still
implementing GFM's "5. foo" -> <ol start="5"> rule.

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extract AbstractListsRewriter from Lists

The list-block CallWriter rewriter mixed two concerns: a shared state
machine that turns flat list_open / list_item / list_close calls into
the nested listu_

extract AbstractListsRewriter from Lists

The list-block CallWriter rewriter mixed two concerns: a shared state
machine that turns flat list_open / list_item / list_close calls into
the nested listu_open / listo_open / listitem / listcontent shape
the renderers expect, and a syntax-specific marker parser that maps
the captured indent + marker text to depth/type.

Hoist the state machine onto a new abstract base class
AbstractListsRewriter; Lists keeps only its DokuWiki marker parser
(`*` unordered, `-` ordered, 2-space-per-level indent). The upcoming
GfmLists will share the same base class with its own GFM marker
parser.

The interpretSyntax contract changes shape:

protected function interpretSyntax($match, &$type): int
to
abstract protected function interpretSyntax(string $match): array;
// returns ['depth' => int, 'type' => 'u'|'o', 'start'? => int]

The optional `start` key carries the first ordered item's number for
syntaxes that support it (GFM); DokuWiki omits it and gets the
default of 1. Plugins subclassing Lists that override interpretSyntax
need to update — known affected: creole, markdowku, mediasyntax (per
codesearch.dokuwiki.org). The migration is mechanical: replace the
by-ref $type assignment and int return with an associative-array
return.

The protected listStart / listOpen / listEnd dispatch methods on the
old Lists are gone (renamed handleListOpen / handleListItem /
handleListClose on the base class), but no plugin in the ecosystem
overrides those, only interpretSyntax.

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