Fix various errors in PHPUnit tests on PHP 8

remove old DokuCLI class

This has been deprecated in 2017. Removing it instead of fixing tests
and PHP8 compatibility

fix global access on detail.php and avoid null loading

Another problem surfaced in the tests

fix undefined array warning in fulltext indexer

This was surfaced on PHP8 and might actually have been a bug before.

Remove ! operator causing unit tests to fail

Fix Undefined array key in xhtml.php

Fix undefined array keys when displaying images

Fix undefined array keys when displaying revisions

Fix Undefined array key in Search/Indexer.php

Fix Undefined array key warnings in template.php

Warning: Undefined array key "__background__" in .../inc/ on line 1275

Triggered for the following language strings: __text__, __background__,
__tex

Fix Undefined array key warnings in template.php

Warning: Undefined array key "__background__" in .../inc/ on line 1275

Triggered for the following language strings: __text__, __background__,
__text_alt__, __background_alt__, __text_neu__, __background_neu__,
__border__ and __highlight__.

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Fix warning when displaying PDF in Media manager

Trying to access array offset on value of type bool in
.../inc/JpegMeta.php on line 1322

Fix Undefined array key "DOKU_PREFS" in common.php

Fix Undefined array keys in Diff.php

Occurs when the selected revision is the first or last of the list,
for both the left and right revs.

Fix Undefined array key "current" warnings

Multiple occurrences when showing a page's revisions.

Fixes #3392

Fix Undefined array key "ns" in search.php

Shown when expanding namespaces in Media Manager.

Fix undefined array key warning in auth.php

Got the following warnings on PHP 8.

- Undefined array key "DW<cookie_hash>" in .../inc/auth.php on line 248
- Trying to access array offset on value of

Fix undefined array key warning in auth.php

Got the following warnings on PHP 8.

- Undefined array key "DW<cookie_hash>" in .../inc/auth.php on line 248
- Trying to access array offset on value of type null in .../inc/auth.php on line 248

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Fix array access on null in Logger.php

Fixes #3391

Fix Undefined array key "fperm" warning

Also removed a few, now unnecessary `!empty` checks

Fixes #3382

translation update

rename namespace Media to File

This is a bit more generic and allows us to have additional File
abstractions in here later.

translation update

translation update

cleaner behaviour for data directory check

Show a properly translated message.

translation update

readded $jump mechanism, removed unused functions