moved all parsing related namespaces to their own

split handler.php into multiple files

For now I left Doku_Handler itself as it were. We will need to keep the
class name around for backwards compatibility but should move the class
itself.

I intro

split handler.php into multiple files

For now I left Doku_Handler itself as it were. We will need to keep the
class name around for backwards compatibility but should move the class
itself.

I introduced a new ReWriter Interface to formalize how the various call
writer implementations are accessed.

There are a whole bunch of doc blocks missing.

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split out parser modes into their own files

This moves all the parser classes into their own namespace and files.
Next up are the handler classes.

I'm not sure about the namespace, yet. A nested na

split out parser modes into their own files

This moves all the parser classes into their own namespace and files.
Next up are the handler classes.

I'm not sure about the namespace, yet. A nested namepspace Parser\Modes
would probably make more sense... we'll see.

This also removes the duplicated coded in the Plugin mode. We now use
the plugin trait and can inherit from AbstractMode instead.

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update parser tests for change in listitem_open instruction

moved _testing to _test