move backlinks() and mediause() into MediaIndex class

obsolete fulltext.php and indexer.php files

define deprecated functions in deprecated.php file.
fix load.php, loading fulltext.php and indexer.php is nolonger necessary.

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name w

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name was selected to be compatible with the
upcoming changes in #2943. This should hpopefully reduce the overall
hassle of touching the same code base.

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Merge branch 'psr2-pluginredux' into psr2

* psr2-pluginredux:
Minor optimizations in PluginController
Snake to Camel case fixes inn PluginController
Fix snake->camel case, doc blocks
minor c

Merge branch 'psr2-pluginredux' into psr2

* psr2-pluginredux:
Minor optimizations in PluginController
Snake to Camel case fixes inn PluginController
Fix snake->camel case, doc blocks
minor code simplification
snake to camel case fixes in EventHandler
Move list of plugin types to plugin controller constant
Avoid accessing the evet system before it's intialized
Avoid processing events before the Event System is intiialized
isEnabled instead of isDisabled
removed get_directory() method from PluginController
fix type hints
moved plugin controller to Extension namespace
removed deleted file from autoloader
deprecated trigger_event() in favor of a static method on Event
First go at moving the plugin classes into their own namespace

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�� Move Subscription class to deprecated.php

This class has been replaced by the classes in the
dokuwiki/Subscriptions namespace.

moved plugin controller to Extension namespace

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

Rename HTTPClient namespace to HTTP

This should make namespace a bit more flexible in scope and allow us to
move more functionality there later.

Move deprecated HTTPClient classes to deprecated.php

PSR2 adjustments for the PassHash class

I opted for ignoring the camel case funtion check not because the public hash_*
methods are widely used but because I find this style actually cleaner
in this

PSR2 adjustments for the PassHash class

I opted for ignoring the camel case funtion check not because the public hash_*
methods are widely used but because I find this style actually cleaner
in this case where the method name is auto-built from the hash type
name.

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adjusted the Input clases for PSR2

They are now in their own namespace.

deprecated JSON class

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

some small fixes for PSR2

split changelog classes into their own namespace

The remaining functions in inc/changelog.php should be moved into a
utility class.

fallback classes for plugins inheriting from old settings classes

This will still throw a signature mismatch warning on PHP7 but at least
it is no longer fatal.

started a dedicated file for deprecated stuff

PSR-2 compatibility for the remote API libs