autoload: Register test namespaces as PSR-4.
plugin discovery: AnnotatedClassDiscovery with PSR-4 style directories.
plugin discovery: Allow annotation namespaces with multiple directories attached.
Register 3 PSR-4 directories for each module namespace:
- ../lib/Drupal/(modulename)
- ../lib
- ../src
This will be cleaned up in a follow-up.
Let DrupalKernel::getModuleNamespacesPsr4() return three PSR-4 directories per directory.
Port discovery of test classes to PSR-4.
Add a script to move all module classes to their new PSR-4 locations
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