usermanager CLI: more cleanup

usermanager CLI: use success messages

This makes it more consistent with the other tools

usermanager CLI: fix parameter order for creating users

usermanager CLI: catch plugin signalled error messages

Plugins may prevent user modifications and will use msg() to tell why.
This will catch the messages and print them on CLI as well

abort early when no auth backend is available

type hints and cleanup

SVG based smileys

This patch replaces our old gif based smileys by SVG based ones from the
Twemoji project. This allows for scaling the emojis with the text
they're used in.

work around disabled php_strip_whitespace. fixes #3271

Media CSP: omit script-src and add frame-ancestors

See comments for details:

https://github.com/splitbrain/dokuwiki/pull/3310#discussion_r506909727
https://github.com/splitbrain/dokuwiki/pull/3310#

Media CSP: omit script-src and add frame-ancestors

See comments for details:

https://github.com/splitbrain/dokuwiki/pull/3310#discussion_r506909727
https://github.com/splitbrain/dokuwiki/pull/3310#discussion_r506913304

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added JavaScript based filter mechanism

Restrictive Content-Security-Policy for media #1045

This adds a CSP header for all media delivered through our fetch.php
dispatcher. This should revent any scripts etc. to be executed when
scriptabl

Restrictive Content-Security-Policy for media #1045

This adds a CSP header for all media delivered through our fetch.php
dispatcher. This should revent any scripts etc. to be executed when
scriptable media, like SVG is used.

Suggestions on finetuning the policy are welcome.

The policy is added to the MEDIA_SENDFILE event, so plugins can easily
influence it. The way it is passed as an array should make it easier to
modify from plugins as well.

I put the mechanism to send the header into it's own class in the HTTP
namespace. Additional methods from inc/httputils could be moved here
later. The method might also be interesting for #2198 and #1676.

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fix: mark inputs of styling plugin as required

While this cannot ensure that the value is valid, it should prevent
accidental saving of an empty field, which crashes the less compiler.

Fixes #2246

replace deprecated function calls #3266

Fixing of cell width

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refresh user cache in plain auth on user modifying

When a user login was renamed, the user appeared twice. Once as the old
user and once as the new user.

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