Windows stack trace improvements

-Windows StackTrace class behavior is closer to DefaultTraceHandler class
-Resolving of the symbols is delayed until they are actually needed for priting
-Fixes issue 1001 for windows x86. Currently D exceptions that are created from hardware exceptions like segmentation faults (access violations on windows) do not have a propper trace info object attached to them. This can easily be tested by running a simple program that produces a access violation.