Updated http://wiki.dlang.org/Debuggers

[Bruno Medeiros]

I took another swipe at the http://wiki.dlang.org/Debuggers wiki page 
and updated the layout, as well as added and cleaned-up some of the info 
there.

This was prompted by two users, in recent weeks, reporting "problems" 
trying to use DDT+GDB to debug DMD produced executable on Windows... :S
I added a note to the DDT to make it clear the above is not possible, 
and referred tot he above wiki page.

I also tried LDC on Windows some time ago and was sad to see debug 
output is not supported at all :(  (the MinGW target is not well 
supported in LLVM apparently)

-- 
Bruno Medeiros
https://twitter.com/brunodomedeiros