Give firecrown.parameters.create a more descriptive name

[tilmantroester]

IMO, create is not a very descriptive name. Especially when used with from firecrown.parameters import create, having code in Updatables that looks like

def __init__(self):
    ...
    self.f_bar = create()

is not very self-explanatory, especially considering all the complexity that happens behind the scenes.
Calling it something like register_new_parameter might be helpful, since I imagine many users are not used to kind of __setattr__ magic that's being used here.