[phobos] Stack traces in druntime/phobos

[Denis]

I've made an attempt to intergrate stack tracer into druntime,
modified runtime.d is attached to this message.

It also relies on codeview.d (which I placed into core.sys.windows
package because it is Windows specific). Strictly speaking, it isn't
mandatory for stack traces to work and I I can get rid of it if you
believe it doesn't belong to druntime, but it adds module names and
line numbers to stack trace (which I believe is a good thing to have).

Symbol names are extracted from a dmd-generated map file. Compile with
-g -map for the best trace info.

It does quite a few of memory allocations, so generating call-stack
for an OutOfMemory exception may result in a stack overflow. It's an
issue I can fix, but it's far from being a trivial one.
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