Use str_starts_with/str_ends_with

code style: static visibility

coding style: control flow whitespaces

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: class declaration braces

Apply rector fixes to config plugin

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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use https URLs in config manager

remove support for _cautionList

Merge pull request #2404 from splitbrain/psr2-config-update-comments

improve update() comments

improve update() comments

make the onoff setting more boolean

We now parse true and false as well as some common strings

fix language and TOC handling

Some first Setting class tests

proper defaults for initialize

There isn't really unset variables, but we do expect null to be passed
for some of them.

This also moves the update method further up as it's logically the next
step.

extract save checking into own method

Instead of having the out() method return empty strings, a new method
tells the writer if a setting should be saved or not. Only then the
out() method is called.

Moved settings to their own namespace