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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updated rector and applied it

�� Rector and PHPCS fixes

Make is_ssl and baseurl use proper proxy checks

This should not only address #4455 but also ensures that the related
headers are only used when they come from a trusted reverse proxy chain.

Use str_starts_with/str_ends_with

code style: multi statements

code style: line breaks

Rector to rename print to echo calls

reformat /lib/exe/ folder

codestyle adjustments: function declaration braces/spaces

codestyle adjustments: function argument spacing

Apply rector fixes to lib/exe

Do not reminify minified plugin scripts

Adresses point 5) of #3645

extracted JS compressor into its own library

This moves our JavaScript compressor into its own composer dependency.

PHP8 fix part 4: Trying to access array offset on value of type bool/null

Fix PHP 7.3 deprecations in lib/ directory.

replaced deprecated utf8 functions

For now this uses full qualified namespaces, sensible imports may come
later.

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

Merge pull request #2689 from splitbrain/refactorCachePSR2

Refactor cache.php to better conform with PSR 2

Use setter instead of deprecate public property

Merge branch 'master' into psr2

Refactor cache.php into different files

removed unnecessary count

php7 fix

php7 syntax fix.
https://forum.dokuwiki.org/thread/15725
https://forum.dokuwiki.org/post/58606

deprecated JSON class

JSON is natively supported since years. This makes
2145bd4c56435f829a19aad843172f8ddffbc69b obsolete again.