Drop dependency on Class::Load.

Moose has been moving away from it and towards Module::Runtime;
Moo also uses Module::Runtime.

For the stack trace class, rather than checking is_class_loaded,
check $class->can("new"), which is more useful as we're going to
call $class->new later.
correct diagnostic message
drop dependency on MooX::Types::MooseLike::Base

...it was barely being used anyway

Conflicts:
	lib/StackTrace/Auto.pm
v0.200011

        - eliminate prereq on Class::Load (thanks, Toby Inkster!)
        - eliminate preqre on MooX::Types::MooseLike::Base (Toby Inkster)