D source code formatting utility (dformat)

[Walter Bright]

Continuing in the vein of the Exceptional coding style thread, D needs (and has 
needed for a long time) a utility that will reformat source code.

One use of it would be to run as a filter on all of the Druntime and Phobos 
source code before checkin.

This could make great use of the current projects to implement a D lexer and 
parser in D.

It'd make for a nice boon to the D community.

Any champions for this?