give user feedback for empty or invalid PDF exports

Collectors used to return an empty page list for a missing page, a missing
namespace or an empty selection, which then failed silently or crashed

give user feedback for empty or invalid PDF exports

Collectors used to return an empty page list for a missing page, a missing
namespace or an empty selection, which then failed silently or crashed when the
first page was accessed. They now throw a translated ExportException instead,
which the action handler turns into feedback: a flash message and redirect for
regular navigations, or an HTTP error with the message in the body for the
background download BookCreator uses. Dynamic message parts are HTML escaped
because that body is injected into the page via a jQuery html() sink.

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extracted PDF generation and sending out of action

Now only event handling happens in the action handler

remove obsolete book chapter handling in action

This is now handled within the renderer itself

rector and codesnifffer fixes

extract $INPUT dependencies out of Collector classes

This should make tests and a future command line interface easier to
implement.

fixed issues from first real run

removed more obsolete methods from action plugin

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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remove obsolete template event

remove some moved methods

move page collecting into separate classes

Handle styles

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

remove a few now unused methods

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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�� Automatic code style fixes

�� Automatic code style fixes

cleanup css loading

require autoload in action.php

load before DokuPDF/mPdf are used.

rector and php sniffer cleanups

cleanup/reformatting action.php

removing restarting of pagenumbering, fixes #393

Since mPDF version 7, the pagenumbering during pdf generation is
improved significantly, so this workaround can be removed.

Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
settin

Use mpdf's own QR code generation instead #465

This drops the dependency of an external service in favor of MPDF's own
barcode library. Sizes are configured somewhat differently there, so the
setting has been renamed.

Obsolete language strings are removed in a follow-up commit

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