replace phpquery by php-dom-wrapper #3308

This replaces the outdated phpquery library by the newer and maintained
php-dom-wrapper. Usage is similar but not a 1:1 replacement. phpQuery is
left in but

replace phpquery by php-dom-wrapper #3308

This replaces the outdated phpquery library by the newer and maintained
php-dom-wrapper. Usage is similar but not a 1:1 replacement. phpQuery is
left in but marked as deprecated.

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Fix PHPUnit fatal errors compatibility with void.

Merge branch 'master' into phpunit8

* master:
dwpage: output meta data as JSON
dwpage: rename gmeta into getmeta
translation update
Make it easier to remove h1 around logo
fix: better max-

Merge branch 'master' into phpunit8

* master:
dwpage: output meta data as JSON
dwpage: rename gmeta into getmeta
translation update
Make it easier to remove h1 around logo
fix: better max-width for images in tables
dwpage.php: add an option to get metadata
rename namespace Media to File
use SVG icons for media file links
readded $jump mechanism, removed unused functions
fix use of $rev parameter
fix entity definition
reenable the option to display a relative namespace for media files
simplified the media_searchlist tests
make use of the new media file classes
SVG based file icons
first go a refactoring the media manager
lazy load images

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add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

simplified the media_searchlist tests

replaced deprecated utf8 functions

For now this uses full qualified namespaces, sensible imports may come
later.

fix file name
closes #2129