add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default im

add event to check access to admin plugins

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default implementation is the same as before, relying only on the
forAdminOnly() method and the users' isadmin or ismanager status.

Admin plugins themselves can override the method to do additional
checks. In this patch, I added that to the usermanager plugin which will
only return true if the current auth backend can list users.

However the real idea behind this change is that the new method emits a
new event called ADMINPLUGIN_ACCESS_CHECK which would allow plugins to
overwrite it. This way it could be possible to give certain user groups
access to certain admin plugins without giving them admin or manager
permissions.

Note: this does not change how the "Admin" link is shown, it still
depends on ismanager or isadmin. A plugin as mentioned above would need
to influence the display via the MENU_ITEMS_ASSEMBLY event.

Note: this only covers the basic access check. Admin plugins may need
further adjustments for access to other parts of the plugin (like AJAX
components). An additional commit will update this for the bundled
plugins.

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add logic if the server uses unlimited memory, memory_limit = -1

unify send_redirect(wl()) parameters
- always use absolute URL
- use static string instead of array if no concat is required
- use '&' instead of '&'

Update inc/Action/Search.php

Co-Authored-By: schplurtz <schplurtz@laposte.net>

use wl() when reditecting old style search url

fixes #2546

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getRecents(): prevent non-exist changelog error. Fixes #2440.

This is based on #2506 but with a different approach to deal with unknown read error: If file function doesn't return an array, set it t

getRecents(): prevent non-exist changelog error. Fixes #2440.

This is based on #2506 but with a different approach to deal with unknown read error: If file function doesn't return an array, set it to an empty array. Somewhat pythonic?

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revert text direction change for translation (fa) in #2508

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�� Better deprecation annotation for DOKU_TPL*

This syntax can be used by IDEA and other IDEs to mark the constants as
deprecated in the editor.

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Hide login form on denied page if login is disabled

add check if a page has once existed and show new onceexisted page

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Another scrutinizer fix.

Added type check to fix scrutinizer message.

Auth/Mailer: properly handle usernames including a comma

Prevent splitting of e-mail addresses at the wrong point by enclosing a username in '"'.
The "To" e-mail address in the notification mail was

Auth/Mailer: properly handle usernames including a comma

Prevent splitting of e-mail addresses at the wrong point by enclosing a username in '"'.
The "To" e-mail address in the notification mail was malformed if a new user was added
and included a ',' in it's name. Fixes #1569.

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