�� Rector and PHPCS fixes

remove unused rewriteBlocks property from Handler

This flag was added in b7c441b9 (2005) for planned wiki syntax
converters but was never set to false anywhere. Remove the dead
conditional and alway

remove unused rewriteBlocks property from Handler

This flag was added in b7c441b9 (2005) for planned wiki syntax
converters but was never set to false anywhere. Remove the dead
conditional and always run Block processing.

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supress code sniffer warning on deprecation wrapper

Previously the whole file was excluded. We can now be more precise.

move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individ

move handler methods into ParserMode classes and rename Handler

Each ParserMode class now implements handle() from ModeInterface,
containing the token handling logic that previously lived as individual
methods on Doku_Handler.

The Handler class (formerly Doku_Handler) is the single dispatch point:
Lexer passes tokens to Handler::handleToken() which routes to mode
objects, plugins, or returns false. The Lexer only tokenizes and
resolves mapHandler aliases.

Key changes:
- Add handle() to ModeInterface, implemented by all mode classes
- Move Doku_Handler to dokuwiki\Parsing\Handler namespace
- File extends Code (shared parsing via $type property)
- Quotes uses mapHandler() + Handler::getModeName() for sub-modes
- Media::parseMedia() replaces Doku_Handler_Parse_Media()
- Code::parseHighlightOptions() replaces parse_highlight_options()
- Per-parse state (footnote, doublequote) stays on Handler
- Deprecated wrappers kept for base/header/internallink/media
- Class alias and rector rules added for backward compatibility

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