D2 port of xfBuild (alpha version)

[Andrej Mitrovic]

FWIW a couple of bugs from the old issue tracker were fixed in the new
fork. Bugs were reported here:
https://bitbucket.org/h3r3tic/xfbuild/issue/16/xfbuild-crashes-if-full-path-to-deps-objs
https://bitbucket.org/h3r3tic/xfbuild/issue/17/xfbuild-crashes-optlink-on-windows-if-o

There was also a multithreaded bug that manifested itself on Windows
where printing to the console would be interleaved and left the
message scrambled. This is now fixed.

Also, the +xpath option was added, first discussed here:
https://bitbucket.org/h3r3tic/xfbuild/issue/1/add-a-xpath-option

I'll have to look into the whole template instantiation "fiasco" and
see where we are at that and if it can be resolved. Stay tuned.. :)

https://github.com/AndrejMitrovic/xfbuild