code style: line breaks

address issues mention in PR#4045

codestyle adjustments: class declaration braces

Apply rector fixes to inc/Cache

update ParserCache dependency to reflect new file location

some more fixes for undefined vars

This makes more use of $INPUT to access $_SERVER and fixes a warning in
one of the search methods.

remove calls to deprecated methods and classes

Use deprecation helper

Instead of writing our own magic getters and setters for all variables
that used to be public, this adds a trait that does that in a generic
way.
This trait was copied from Me

Use deprecation helper

Instead of writing our own magic getters and setters for all variables
that used to be public, this adds a trait that does that in a generic
way.
This trait was copied from MediaWiki and adjusted to DokuWiki.
The original author seems to be @tgr Tisza Gergő

The downside of this trait is that the properties keep their
(potentially undesired) name. While that could be fixed within the
helper, that might add unnecessary complexity. The name can change when
support is dropped.

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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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Fix typo and rename method in comments too

Rename methods to conform with PSR 2

The method _useCache doesn't seem to be in use outside the core cache
classes[0], thus no deprecation placeholder was created.

[0]: https://codesearch.dokuwiki.

Rename methods to conform with PSR 2

The method _useCache doesn't seem to be in use outside the core cache
classes[0], thus no deprecation placeholder was created.

[0]: https://codesearch.dokuwiki.org/search?project=dokuwiki&project=plugin&project=template&q=&defs=&refs=_useCache&path=&hist=&type=php

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Refactor cache.php into different files