use correct FeedOptions methods. fixes #4203

This makes feed.php use the correct methods for setting the feed type
and content-type header. It also adds the missing type definition for
RSS 1.0

�� Rector and PHPCS fixes

remove obsolete feed creation code

This was left over in #4156

�� Rector and PHPCS fixes

Feed creation refactoring

This breaks up the humongous functions from feed.php into multiple
classes. To keep compatibility with existing Plugin events, the basic
principle of how the feed is assemb

Feed creation refactoring

This breaks up the humongous functions from feed.php into multiple
classes. To keep compatibility with existing Plugin events, the basic
principle of how the feed is assembled has not been changed:

* depending on the given mode and other options lose arrays of items are
gathered
* these items are then converted (again based on the various options)
into proper FeedItems
* the FeedItems are then added to the Feed

The conversion from loosely typed item data to something more structured
is now done by the FeedItemProcessor classes. Some very basic tests have
been added. It does not cover erverything but covers more than before
(which was nothing).

Manual testing before merging this is highly recommended. I am not
confident that I ported over everything correctly.

No new features have been added, but especially media support could and
should be improved in the future.

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use $auth instanceof AuthPlugin instead of not null check

Rector to rename print to echo calls

coding style: control flow line breaks

coding style: control flow whitespaces

reformatting at top level

coding style: function call spacing

Apply rector fixes to bin and toplevel

Fix titles in feeds

The check introduced in 6fd2d4b0 did not work when media was set
explicitly to false.

fix warnings in feed.php. #3728

fix linelengths in feed.php

Code Style fix

feed.php updates:

* search is disabled
* code style fixes

Renamed constant to RECENTS_ONLY_CREATION

This clarifies that it also works when requesting media changelog.

Implemented only_new option for RSS feed, so you can request RSS feed that contains only new files.

initialize rssRecentChanges flag to 0

Add option rss_show_deleted

deprecated trigger_event() in favor of a static method on Event

First go at moving the plugin classes into their own namespace

Rename fields and add deprecated __get/__set

These fields might still be accessed from the outside, so in order to
not break backwards compatibility, this uses magic methods that emit
deprecation er

Rename fields and add deprecated __get/__set

These fields might still be accessed from the outside, so in order to
not break backwards compatibility, this uses magic methods that emit
deprecation errors.

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Refactor cache.php into different files