Fix PHPUnit fatal errors compatibility with void.

add needed type hints for phpunit8

This will break a lot of plugin tests, but can't be avoided

Thorough tests for EO, DE, PT and ES

Correction for German collation; examples for German and Spanish; much better comments

Tests for Portuguese and Spanish

Collations for Portuguese and Spanish; examples for Portuguese; better comments

Changes according to revisions in https://github.com/moisesbr-dw/dokuwiki/pull/2

Many minor details and use of Sort::xyz() instead of intl_xyz() in files outside the "inc" folder.

test the collator fallback always

Now the use of the intl extension can be turned off, allowing for easy
testing of the fallback. The test now inherits from the collator test so
we avoid too much du

test the collator fallback always

Now the use of the intl extension can be turned off, allowing for easy
testing of the fallback. The test now inherits from the collator test so
we avoid too much duplicate code

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wrap sorting functions into their own class

Collator re-creation in unit test

Documentation update

Minor changes.

Test class for sort without collator