Apply rector fixes to inc/Cache

Use getters instead of deprecated property

Consistent capilization of io_saveFile and psr-2 formatting

Check code style against PSR12

In 2019 PSR-12 was officially released and PSR-2 deprecated. We should
adapt to that and check our files against that new coding standard.

some more PSR2 cleanup

mostly overlong lines and more exclude patterns

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

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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Use DokuWiki's own deprecation reporters

DokuWiki has its own way to report deprecation notifications.
Let's use it!

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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Adjust comment to better reflect method

That method cannot be private or protected, since it has to be used by
the event handler. Thus adjust the method comment to internal to better
represent that

Adjust comment to better reflect method

That method cannot be private or protected, since it has to be used by
the event handler. Thus adjust the method comment to internal to better
represent that it shouldn't be used by other classes.

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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