fix (parsing): avoid newline loss on GFM section editing

The GFM header parsing returned a byte position pointing at the newline
before the actual header resulting in the observed newline eatings as

fix (parsing): avoid newline loss on GFM section editing

The GFM header parsing returned a byte position pointing at the newline
before the actual header resulting in the observed newline eatings as
reported in https://github.com/dokuwiki/dokuwiki/pull/4636#issuecomment-4491970909

Additionally this fixes an oddity of DW header parsing which
accidentally allowed text on the line before the opening = chars.
Whitespace is still allowed.

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Block: collapse [ \t]*\n[ \t]* to \n inside paragraphs

Strip [ \t]+ on either side of the soft-break joiner emitted for a
single eol, and ltrim the first cdata of each paragraph. Without this,
DokuW

Block: collapse [ \t]*\n[ \t]* to \n inside paragraphs

Strip [ \t]+ on either side of the soft-break joiner emitted for a
single eol, and ltrim the first cdata of each paragraph. Without this,
DokuWiki preserved leading/trailing whitespace on continuation lines
verbatim, which is invisible in HTML but may visible in plain-text
and other renderers. It is also a requirement in the Markdown spec.

Re-baseline the parser-mode tests that pinned the old preserve
behavior (cdata adjacent to <code>/<file>/<rss>/header/footnote).

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migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Le

migrate parser tests to modern namespaced classes

Move old-style parser tests from _test/tests/inc/parser/ to namespaced
test classes under _test/tests/Parsing/ParserMode/ and
_test/tests/Parsing/Lexer/.

- Add ParserTestBase with assertCalls() helper for comparing handler
call sequences with byte index stripping
- Split lexer.test.php into ParallelRegexTest, StateStackTest, and
LexerTest with a RecordingHandler that extends Handler
- Merge handler_parse_highlight_options tests into CodeTest
- Add new tests for previously untested modes: Nocache, Notoc, Rss,
and all individual formatting modes (Strong, Emphasis, etc.)
- Modernize test code: [] syntax, lowercase null, correct assertEquals
argument order, replace deprecated withConsecutive and string callables
- Renderer tests remain in old location (renderers not yet migrated)

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