This PR removes a check that always tried to autocomplete a class using its__init__ function.

In fact, theinspect module (used afterwards in

) does a much better job at finding the arguments that are actually typing a class, which aren't always the ones in__init__. Since at least Python 3.6, it handles__call__,__new__ and__signature__ in addition to__init__, so restricting the signatures to__init__ is actually a downgrade.
Seehttps://github.com/python/cpython/blob/2c56c97f015a7ea81719615ddcf3c745fba5b4f3/Lib/inspect.py#L2284

I'm raising this issue because our CLI requires__signature__ to work, which is the case if you letinspect.signature do its job by default but not if you manually selectcls.__init__ 🙂

Note: I also doubt that the__new__ check below is useful on modern Python versions, since__new__ is also checked byinspect.signature (therefore byinspection.getfuncprops), but I didn't remove it in this PR.