Fix undefined behavior of RefMutContainer

[jopemachine]

Fixes #33, #27, #17, #18.

>>> import rraft
>>> c = rraft.Config()
>>> r = c.make_ref()
>>> c = None
>>> r
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception: Cannot use a destroyed object's reference!
>>> r.get_id()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception: Cannot use a destroyed object's reference!
>>> 

[jopemachine]

Only applied to Config type at first.

[jopemachine]

I also try to fix #27 here.

[jopemachine]

I checked that this PR also resolve #17.
Passing the Logger_Ref variable to Network.new no longer causes weird behavior.

[jopemachine]

CI fails currently regardless of the test result.
I will look into it.