json-cpp Code

Fixed compilation issue on windows (avoid using cstring and use string.h instead).

- rewrote doxygen documentation generation integration with Scons (still need some clean-up): list of sources is explicitly passed to a doxyfile builder which is used as input of a doxygen builder. Hence, the doxyfile depends on all the sources.
- documentation is now correctly generated once when source are changed on the first scons run.

Added rought roadmap.

Unneeded comment.

This file is auto-generated, even if it already exists. That is causing scons dependency problems, but the right answer is not to add the file, apparently.

added comment -- I always have to run twice to build docs because the doxyfile gets updated and causes scons to get confused. I do not know how to fix this, but I simply run 'scons doc/doxyfile' first.

added dependency

Stripped carriage return and added eol-style native prop.

Updated platform on linux-gcc to include compiler version (necessary for multiple targets built in same directory, and not a bad idea for other builds).

Without this file, scons must be run twice initially. Hopefully, the file gets rebuilt properly, as I do not know how to fix the scons rule correctly.