feat(search): use dedicated url-parameter for search query

This way we do not loose the context of the current page. Further, the
new id generated from the query before wasn't really that useful (se

feat(search): use dedicated url-parameter for search query

This way we do not loose the context of the current page. Further, the
new id generated from the query before wasn't really that useful (see
issue #1124 ). And we can still generate a meaningful link "create a
page for your query", if that is considered useful.

Further redirects exist for the old urls, so bookmarked searches etc.
should mostly keep working.

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feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
fro

feat(search): add config options to adjust default behavior

This adds two new config options:

`search_limit_to_first_ns`:
Limit the search to the current X namespaces. When a search is executed
from a page within a deeper namespace, the first X namespaces will be
added as filter.
Possible use case could be with language namespaces to ensure that the
default search is initially within the current language.

`search_default_fragment_behaviour`:
Option to specify the default fragment search behavior

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refactor(Search): refactor html_search into Ui/Search

This commit should be without functional changes.

load text in source action. fixes #2110

never redirect from a redirect action

during testing, redirects may not be executed, ActionAbort can default
to redirecting which ould create an infinite loop.

fixed some style errors found by scrutinizer

handle draftdeletion in draftdel action only

This was the last remaining function in inc/action.php that could be
moved to the actions.

We now have quite the elegant cascade in the action handling.

have all subscription handling in subscribe action

uses the explicit redirect abort on success

introduce a redirect action

Action can now abort to 'redirect' to explicitly trigger a redirect
back to showing the current page. Automatic triggering for post->show is
now only done when a 'show' a

introduce a redirect action

Action can now abort to 'redirect' to explicitly trigger a redirect
back to showing the current page. Automatic triggering for post->show is
now only done when a 'show' action was not explicitly requested.

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allow actions to throw exception that are shown to the user

move draft saving to Preview action

This also removes duplicated code from ajax.php

drafts are for anonymous users, too. fixed Draftdel action

fixed paging through recent changes

draft action now checks that a draft exists

fixed small typo

no longer rely on actionOk when checking if actions are disabled

loadAction() and checkAction() are now public and could be used within
actionOK(). However some weird circular references prevent tha

no longer rely on actionOk when checking if actions are disabled

loadAction() and checkAction() are now public and could be used within
actionOK(). However some weird circular references prevent that. In
addition, actionOK is also used to check for things that aren't Actions
(yet) like 'rss' and 'top'.

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explicitly declare method visibility

allow actions to be initialized without an action name

also fixes the tests

added missing backlink action

fixed Diff action

added missing Revisions action

make use of sub action for Profile deletion

fixed export action by supporting underscores in actions

Now underscores can be used to have sub actions. The loader will try to
find an exact match first, then begin removing parts from the end unt

fixed export action by supporting underscores in actions

Now underscores can be used to have sub actions. The loader will try to
find an exact match first, then begin removing parts from the end until
a matching action is found.

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Add action plugin hooks back into the ActionRouter

This is not how integration of plugins would ideally be done in this new
system. Ideally an action plugin would actually implement an instance of
A

Add action plugin hooks back into the ActionRouter

This is not how integration of plugins would ideally be done in this new
system. Ideally an action plugin would actually implement an instance of
AbstractAction and would just fall into the normal flow of actions here.

However to not break a gazillion of existing plugins, this is just add
the existing two events into the new system through the use of a Plugin
action.

Maybe we could add "new" action plugins later.

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more doc block fixes