feat: Allow overwriting the output configuration

Currently the export via bookcreator fails if output is set to Browser.
Hence now Bookcreator cann supply outputTarget=file to force the output
as Do

feat: Allow overwriting the output configuration

Currently the export via bookcreator fails if output is set to Browser.
Hence now Bookcreator cann supply outputTarget=file to force the output
as Download.

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support image revisions

respect $DATE_AT in html output; proper cache file list generator

report the Mpdf Exceptions as wiki msg

Replaced more references to '$ACT' in 'collectExportPages'.

Code cleanup: replaced references to '$ACT' with '$event->data' on processing event 'ACTION_ACT_PREPROCESS'.

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fix: sort numbers after namespace separators

When sorting by pagename, then we want the pages in the following order:

page
page:subpage1
page:subpage2
page2
page2:subpage3

Prior to this commit the

fix: sort numbers after namespace separators

When sorting by pagename, then we want the pages in the following order:

page
page:subpage1
page:subpage2
page2
page2:subpage3

Prior to this commit they were sorted:

page
page2
page2:page3
page:page1
page:page2

The cause of this bug was, that the character ':' comes after the numbers in
the ascii-table.

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implement the PDF export button for the new menu system

This works with the changes proposed in splitbrain/dokuwiki#1821

Version upped

mpdf supports only PHP 5.6+ -> fix travis

Remove stray debug ouput

Replace spaces with tabs in mpdf code ��

Fix missing images by injecting ImageProcessor Decoratror

This implements the changes in mpdf/mpdf#460

This should fix #287 and should fix #286

Version upped

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Add the actual mpdf files instead of just a submodule

updated dependencies

we ignore paragonie/random_compat because it's provided in DokuWiki core
already.

x

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Hide pdf-export-link in pdf

The link to export a page or namespace in a pdf is not helpful in the
pdf itself.

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Make global