Issues with reprs

[ceball]

I will split this issue up into smaller issues describing what I think is best to do; just noting various issues for now...

For this example code:

import param
import paramnb

class Something(param.Parameterized):
    a = param.Number(default=1)

s = Something()

class SomeFn(param.ParameterizedFunction):
    a_dict = param.Dict(default={'s':s})
    a_list = param.List(default=[s])
    a_param = param.Parameter(default=s)
    a_selector = param.ObjectSelector(objects=[s])

f = SomeFn.instance()

paramnb.Widgets(f)

Inconsistent reprs

Confusion about editing

(Note re. above: it's not clear because of the loop, but once it's gone orange there's no way back except recreating the widgets.)

[philippjfr]

Yeah not sure what to do here yet, the text boxes are set up to handle python literals, parameterized objects weren't considered.