std.experimental.logger formal review round 3

[Dicebot via Digitalmars-d]

Jut for the reference, my position on current state of things as 
review manager is this:

I agree with some of mentioned concerns and would like to see 
those fixed. However, I don't think any of those are truly 
critical and this proposal has been hanging there for just too 
long. In my opinion it will be more efficient to resolve any 
remainining issues in follow-up pull requests on case by case 
basis then forcing Robert to do it himself - there will be some 
time left before next release to break a thing or two before 
public statement is made.

Because of that I am going to start voting despite some arguments 
being still in process. I hope that won't cause any tension.