�� Rector and PHPCS fixes

SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by t

SearchIndex: rewrite FulltextSearch to use FrequencyCollectionSearch

Replace FulltextIndex->lookupWords() with FrequencyCollectionSearch which
correctly handles the compact tuple format written by the new Indexer.

Introduce QueryEvaluator with typed stack entries (PageSet,
NamespacePredicate, NegatedEntry) for RPN query evaluation. NOT wraps
its operand instead of computing a universe complement, so AND with a
negated operand becomes efficient set subtraction. The full page index
is only loaded for standalone negative or namespace-only queries.

Move QueryParser and QueryEvaluator into the new Search\Query namespace
along with the stack entry types.

Simplify FulltextSearch to orchestration: parse query, look up words,
evaluate, filter, sort. Replace FT_SNIPPET_NUMBER constant with
maxSnippets property. Combine ACL/existence/time filtering into a
single pass.

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Merge branch 'master' into searchIndex-finish

There were a lot of conflicts to resolve. Not all of them may have been
resolved correctly...

* master: (1094 commits)
Login accessibility improvemen

Merge branch 'master' into searchIndex-finish

There were a lot of conflicts to resolve. Not all of them may have been
resolved correctly...

* master: (1094 commits)
Login accessibility improvements
Translation update (it)
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Remove HTML from strings based on title and tagline
SECURITY: fix XSS vulnerability. fixes #4512
translation update
Fix typos in usermanager English strings
Replace hardcoded message by localized string
set DOKU_INC in rector
...

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Apply rector fixes to inc/Ui

change static methods into instance methods

resolve conflictions, CodeSniffer errors

rewrite deprecated ft_* functions

Fix links with invalid empty target attributes

The advanced search options list links with an invalid empty target
attribute. This fixes that by skipping empty parameters.

refactor: rename dta and dtb parameters

They are now named min and max respectively, which is hopefully less
cryptic.

refactor(search): rewite SearchState to make behavior more obvious

As suggested by @splitbrain SearchState now behaves simliar to the PSR-7
message interfaces.

refactor(search): shorten get parameters

feat(search) more nuanced tool deactivation

This gives create control over when a query is too complex for tool
support.

feat(search) add option to sort by mtime

refactor(search): extract simplified SearchState class

Building the new search links is complex and we're going to add another
parameter with the new sorting by mtime. Extracting a new class seems
l

refactor(search): extract simplified SearchState class

Building the new search links is complex and we're going to add another
parameter with the new sorting by mtime. Extracting a new class seems
like the cleanest way to handle that increasing complexity.

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