coding style: function call spacing

Apply rector fixes to inc/Utf8

replace deprecated call to dbglog. fixes #3726

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