�� Rector and PHPCS fixes

replace LESS library. fixes #4088

This replaces the abandoned fork with my own fork at splitbrain/lesserphp

That fork has been cleaned up somewhat and the issues in #4088 should be
fixed.

translation update

translation update

show update message in Extension Manager if available

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translation update

return false in getUserData in case of errors

The interface contract for the method getUserData does not allow an empty array to be returned.

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correctly escape comments in user names. fixes #4099

do not pass referrer on api retry. fixes #3824

Our cache system ignores purge requests that have a referrer. The idea
is to avoid permanent recaching because a purge link was posted
somewhere.
Howev

do not pass referrer on api retry. fixes #3824

Our cache system ignores purge requests that have a referrer. The idea
is to avoid permanent recaching because a purge link was posted
somewhere.
However for the retry link in the extension manager we actually want the
link to work. So this patch supresses the referrer for that link.

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More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
ex

More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
extension manager still tried to deserialize the data.

This changes all communication from php-serialized to JSON encoded data.
When JSON-decoding fails, the data is ignored and an error message is
shown. Failure data like this will not be cached.

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API: code style fixes

wild stab at fixing a failing test

RemoteApiTest::testCreateUserFailAccess failed on github but worked for
me. Seems to be a caching problem in auth_ismanager()

API: move user related tests to usermanager plugin

OpenAPI docs: fix error code deduplication

API: clean up error codes

Error codes are now extracted from API core and printed on the OpenAPI
overview page. This makes it easier to see what is in use.

Error messages have been cleaned up, some

API: clean up error codes

Error codes are now extracted from API core and printed on the OpenAPI
overview page. This makes it easier to see what is in use.

Error messages have been cleaned up, some new codes have been assigned.

Some errors have been removed. Eg. it is fine to iterate a media
namespace you don't have read access to. The result will either be empty
or contain files from lower namespaces that you *do* have access to.

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moved OpenAPI generator to correct namespace

added missing doc blocks

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations including
proper error signalling using Exceptions
2) refactor admin and cli components to make use of 1)
3) make the operations in 1) available via the API

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add title to api explorer

OpenAPI Explorer basically works

Adjust ACL remote component to new system

There is no need to implement getMethods anymore. All data comes from
reflection