Preformatted: strip leading/trailing blank-line padding from body

The lexer's `\n ` continuation pattern eats the indent off
blank-but-indented source lines, leaving a `\n` in the rewriter
buffer

Preformatted: strip leading/trailing blank-line padding from body

The lexer's `\n ` continuation pattern eats the indent off
blank-but-indented source lines, leaving a `\n` in the rewriter
buffer for each one. Trim those padding newlines before emitting
so the preformatted body starts and ends on a non-blank line, as
GFM example #87 requires. Whitespace-only blocks are still
skipped entirely.

Adds two PreformattedTest cases pinning the new behavior.

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deduplicate finalise() across rewriter subclasses

Move the identical finalise() logic into AbstractRewriter with an
abstract getClosingCall() method. Lists, Quote, Table, Preformatted
and Nest each

deduplicate finalise() across rewriter subclasses

Move the identical finalise() logic into AbstractRewriter with an
abstract getClosingCall() method. Lists, Quote, Table, Preformatted
and Nest each provide their closing call name instead of duplicating
the full method.

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code style: line breaks

code style: operator spacing

Apply rector fixes to inc/Parsing

Fix accessing calls

Some plugins need access to the handler (and rewriter) calls. One
example is the do plugin.

This adds some accessing methods to the callWriter objects, ensures
$calls can be acc

Fix accessing calls

Some plugins need access to the handler (and rewriter) calls. One
example is the do plugin.

This adds some accessing methods to the callWriter objects, ensures
$calls can be accessed and removes some duplicate code by introducing an
abstract base class.

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moved all parsing related namespaces to their own