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

work around disabled php_strip_whitespace. fixes #3271

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added JavaScript based filter mechanism

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

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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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