Fix revision handling

Rename DokuPdf class to avoid accidental deletion based on deleted.files

deleted.files includes DokuPDF already, and on some systems the extension manager might delete DokuPdf as well

pass the Config object into the renderer

This streamlines the configuration to a single point of entry. The
renderer was the last bit not adhering to that.

Overhaul chapter/header counting in renderer

Using static variables makes it impossible to automatically test this
correctly.

The PDF renderer is now a singleton. The Writer class initializes it
an

Overhaul chapter/header counting in renderer

Using static variables makes it impossible to automatically test this
correctly.

The PDF renderer is now a singleton. The Writer class initializes it
anew for each export, but during the export, the same renderer is
reused.

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make PdfExportService reusable in debug mode

This refactors the service so that tests can easily access the produced
debug HTML

some minor fixes based on PR feedback

rector and codesnifffer fixes

fix additional blank page at the end

rewrite internal links. implements #526

fixed issues from first real run

decouple renderer

This starts to approach #528 and #526

more refactoring

The basic handling of page collecting, caching and rendering is now
defined.

There is still some ugly dependency in the renderer and the
ImageProcessor loading is not reimplemented

more refactoring

The basic handling of page collecting, caching and rendering is now
defined.

There is still some ugly dependency in the renderer and the
ImageProcessor loading is not reimplemented yet.

After the above a first attempt to actually run the code can be made.

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Handle styles

We now have a Styles class that takes care of loading the styles from
plugins etc.

handle debug writing

add toc handling

first start at refactoring

We now have a few classes that separate the concerns

DokuPDF - inherits from mPDF and doesn't do much anymore except for a
few internal defaults and overwrite

first start at refactoring

We now have a few classes that separate the concerns

DokuPDF - inherits from mPDF and doesn't do much anymore except for a
few internal defaults and overwrites
Config - encapsulate the configuration (file and input vars) and created
an mpdf config array
Template - handles loading the template files and applies placeholders
Writer - composites the above classed and gives access to write
operations

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