also rename wchar -> utf8 to avoid conflict with <wchar.h> (requires
rebuild of workspace)
(unfortunately copying history fails to "502 bad gateway"; had to delete
old + add new independently)
This was SVN commit r7340.
move dbghelp and powrprof-specific stuff into external_libraries
dbghelp: dynamically import functions to avoid needing the .lib
This was SVN commit r6912.