require allowdebug for debug output requested via URL

The debug URL parameter dumped the raw mPDF HTML and bypassed the cache for any
visitor. It is now honored from the URL only when core allowdebu

require allowdebug for debug output requested via URL

The debug URL parameter dumped the raw mPDF HTML and bypassed the cache for any
visitor. It is now honored from the URL only when core allowdebug is enabled;
the config/programmatic path stays trusted.

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fix export of pages named 0

The current page id was only applied as the export default when truthy, so a
page literally named "0" was treated as if no page was given. Use blank() so
"0" is accepted

fix export of pages named 0

The current page id was only applied as the export default when truthy, so a
page literally named "0" was treated as if no page was given. Use blank() so
"0" is accepted as a valid id.

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Use caching settings

fix config attrbutes and extend tests

Use attributes in config class to denote how to initialize them

This should make it easier to add new configuration and see with a
glance how it is initialized.

some minor fixes based on PR feedback

extracted PDF generation and sending out of action

Now only event handling happens in the action handler

rector and codesnifffer fixes

for exporting single pages do not rely on $ID

We want the ID to be passed via Config as well.

address some of the remaining FIXMEs

extract $INPUT dependencies out of Collector classes

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

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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