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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code style: operator spacing

Apply rector fixes to inc/Parsing

Merge pull request #2433 from splitbrain/issue2399

Fixed broken link rendering for external links at start of line

Public access to patterns in external link parser

Fix php styling of too long regexp

Fixed broken link rendering for external links at start of line

External links at the start of line like 'www.example.com' were
not rendered as links any more. The issue was introduced with PR #1988

Fixed broken link rendering for external links at start of line

External links at the start of line like 'www.example.com' were
not rendered as links any more. The issue was introduced with PR #1988.
Fixes #2399.

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moved all parsing related namespaces to their own