thank you Dicebot for the work.
I thought I give a quick update.
* The interface now works on overloads with template constraints.
* The internal api has been split in logHeader, logMsgPart and
finishLogMsg (writeLogMsg) can still be used
* StdIOLogger and StdErrLogger are replaced by
FileLogger(stdout|stderr)
* FileLogger take std.stdio.File as parameter for the ctor,
though files can be closed on scope exit
* FileLogger flush after logging
* new DataTime formatter to output range (placeholder until
std.datetime comes up with something)
* fixed all spelling mistakes given in the review
* more documentation (introduced new spelling mistakes ;-) review
please)
* ArrayLogger and MultiLogger use same std.container.Array based
base class
* More stuff I forgot about
please review and let us get this thing moving
