Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

We can't use an authoritive classmap in the current state as it would
kill app loading. However we can use a proper classmap for the normal
core stuff.

This adds the OCP namespace to the composer autoloader as well.
This means that now we can use proper PSR-4 filenames in OCP.

This introduces the defacto standard PSR-4 autoloader from composer into
core. This will allow proper PSR-4 naming of our classes.

Since our original autoloader is still available we can slowly switch
over classes to PSR-4.