Cache: key on resolved base URL instead of the raw Host header

The instruction (.i), render (.xhtml) and metadata cache keys embedded
the client-supplied HTTP_HOST and SERVER_PORT, as did the JS and

Cache: key on resolved base URL instead of the raw Host header

The instruction (.i), render (.xhtml) and metadata cache keys embedded
the client-supplied HTTP_HOST and SERVER_PORT, as did the JS and CSS
dispatchers. A crawler varying the Host header - or a wiki reachable
under several names - thus multiplied every cached artifact per host
value, growing the cache directory without bound.

Instructions and metadata never embed resolved URLs, so they drop the
host component entirely. Rendered output and the JS/CSS bundles key
on DOKU_BASE (plus the SSL flag for JS) instead: fixed when baseurl is
configured, and only varying for genuine multi-domain canonical setups.
Feeds keep host/port keying since their links are always absolute.

This should address the obvious cases mentioned in #4574

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code style: line breaks

coding style: control flow line breaks

coding style: control flow whitespaces

Apply rector fixes to inc/Cache

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