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Fix handling of unknown array settings

When a plugin used an array setting and was then installed, the old
configuration can remain in local.php. It is handled by the
SettingUndefined class. However

Fix handling of unknown array settings

When a plugin used an array setting and was then installed, the old
configuration can remain in local.php. It is handled by the
SettingUndefined class. However this class used the base out() mechanism
which didn't know about arrays. The result was a fatal error resulting
in a completely empty config file.

This moves the error handling from the SettingArray class to the base
class which fixes the original problem.

It also adds a check if the Writer is about to write a completely empty
config file and refuses to do so, throwing an Exception.

Probably related to #3777

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remove language strings for htmlok and phpok options

These options have been removed in bbe6b3a78bfaae7c3435ed2f909108be642b4684

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Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had

Remove the htmlok and phpok embedding options

Both options have grave security implications and novice users seem to
ignore advice about them. In the last decades I never came across a wiki
that had legitimate use of these options.

If someone needs the functionality, it can easily be added back using a
plugin. But I prefer to give users one less option to shoot themselves
in the foot.

Removal of the translations for the config strings can follow after this
has been merged.

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log warnings to error log

This introduces an error handler that will log warnings, including a
stack trace in the error log. This should help plugin and core authors with
identifying cases of uninit

log warnings to error log

This introduces an error handler that will log warnings, including a
stack trace in the error log. This should help plugin and core authors with
identifying cases of uninitilized variables in PHP8+ environments.

A feature flag (default off) will let users temporarily disable the
display of warnings in the frontend. This should allow the usage of not
yet upgraded plugins in many cases. In the future the flag can be
removed again.

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