TYPO3 Core

The alias map in form system extension is a workaround
to enable case insensitive class loading for specific
form classes.

Instead of misusing this technology, introduce an object factory
class which does the mapping within the form extension where it belongs
without affecting the complete system.

By doing so and removing the last alias map (besides the one in compatibility6)
we now have to improve our code for dynamic alias addition since the default
loader is not the alias loader any more but the regular composer class loader.