use SVG icons for media file links

The dokuwiki template should probably be adjusted a bit. Old png files
are not yet removed as they may be used elsewhere still.

SVG based file icons

To be used in the new code. Courtesy of https://fileicons.org/

do not repeat successful security checks. fixes #3363

This avoids creating lots of 403 errors for properly secured data
directories. Only one successful check per browser session will be
executed.

fix style problem

Log opcache invalidation failure to debug log

Suppress error in opcache_invalidate() call

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extension manager: fix for empty API result. fixes #3330

codestyle fixes

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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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