add needed type hints for phpunit8

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

First go at moving the plugin classes into their own namespace

Merge branch 'master' into psr2

* master: (22 commits)
Support "local" subdir when listing the smiley directory
fix zero ID/NS issue with page_findnearest
add ID/NS = '0' test against page_fin

Merge branch 'master' into psr2

* master: (22 commits)
Support "local" subdir when listing the smiley directory
fix zero ID/NS issue with page_findnearest
add ID/NS = '0' test against page_findnearest
fix zero value issue with metadata indexer
add key/value = '0' test to metadata indexer
fix zero ID issue with linkwiz and search indexer
fix zero ID issue with wl() and getID()
add $ID = '0' test against wl() and getID()
cookie.js when setValue‘s value parameter is false delete entry
install.php: respect useacl=0 choice, fixes #2576
cookie.js add def parameter to getValue()
cookie.js convert value type to string
set_doku_pref bugfix, closes #2721
more definition tests of doku_pref, for #1129
add tests for get/set_doku_pref #2721
fix Windows tests for #2702
use absolute URL in index.php when redirecting to doku.php, fixes #2706
Adding "recursive_groups" setting for authad-plugin in configuration-manager
Fix notices when using dw CLI
Fix issue #2396
...

show more ...

add ID/NS = '0' test against page_findnearest

fixed broken tests

I also introduced an auto loaded namespace for the tests.

replace some var keywords

This should fix some tests on PHP 7.1. The work is far from done, we
still have a lot of variables without proper accessibility defined.

renamed ignoreacl parameter to useacl

Add an ACL check in page_findnearest, fix #1369

This means that templates that use this function will no longer display
pages like sidebars that can't be accessed by the current user.

Improved sidebar inclusion

Template authors now can use tpl_sidebar() to include the sidebar.
Sidebars can be defined in subnamespaces as well