Add classmethods to globals for jump-to-globals list, similar to Eclipse...

You may or may not want this, but I was missing how Eclipse's Globals browser also included classmethod definitions in its Jump-To-Globals list, e.g.

    class Foo(object):
        def bar(self): pass
        def baz(self): pass

would include

    Foo
    bar
    baz

as navigable items in the jump-to-global list

Also added a settings key to enable/disable this behavior, since it slows the search slightly (more objects to index)