Split exception handling in deh/deh_win32/deh_win64_posix

The original file names (deh and deh2) are not very descriptive. This
structure is inspired by the section and section_xxx modules.

_d_createTrace() implementation is left in the deh module because is
common to all the architectures.
Merge pull request #565 from leandro-lucarella-sociomantic/deh-split

Split exception handling in deh/deh_win32/deh_win64_posix