�� Rector and PHPCS fixes

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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.

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�� Rector and PHPCS fixes

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show update message in Extension Manager if available

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remove obsolete feed creation code

This was left over in #4156

io_deleteFromFile: pass a string not null

�� Rector and PHPCS fixes

Updated composer dependencies

fix is_ssl() check

There was a global statement missing? This seems to have to been
broken in one of the recent merges.

Tests have been cleaned up but not changes in logic.

return false in getUserData in case of errors

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

�� Rector and PHPCS fixes

fix FeedPageProcessorTest on Github

It seems that the dataProvider generator runs before the rest of the
test suite, resulting in a wrong modification timestamp being read.

It's unclear why this ha

fix FeedPageProcessorTest on Github

It seems that the dataProvider generator runs before the rest of the
test suite, resulting in a wrong modification timestamp being read.

It's unclear why this happens on Github only.

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check feed validity at w3c validator

feed: use default favicon as very last resort

The dokuwiki logos we deliver in the wiki namespace are preferable.

feed: set item date. fixes #2960

The date was completely missing in the recent refactor. This readds it
and uses a unix timestamp as suggested in #2960

style fixes

feed: set tagline as subtitle. fixes #2239

Update rector and the used class namespace

Seems like the class alias for Rector\Core is removed in 19.2 This
should fix the rector runs on github.

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