[TASK] TestingProvider is not usable by other package

Currently the TestingProvider can only be used by Flow package. The
settings contain a requestPatterns that limit the usage of this provider
for "TYPO3\Flow\Tests\.*". Other package need this provider for
functionnal testing.

Change-Id: I45dd54bcb47977e7303a1fbbd8dce4ab57839a46
Resolves: #45953
Releases: master, 2.0
[TASK] RoutePartHandler translit must be improved

Currently the RoutePartHandler is bit to german only, this patch propose
to use iconv to have better transliteration for other language. This is
a temporary solution, as the transliteration must be done in l18n
subpackage.

Change-Id: I15ab21faf47b62a38c66c0d457d18e8d7a627c8b
Related: #45917
Releases: 2.0, master