Remove version 5 road map since version 5 has been released.
Update version 6 road map to reflect current development goals.
Cleaned out old goals from generic road map in preparation for version
7 development.
Add note to compiling document about building with Boost 1.70 on Windows.
Fix link to Linux coding style policy in KiCad Coding Style Guide.
Update tool framework documentation to reflect changes in the tool
framework code.
(cherry picked from commit 3caa4376a5)
Update version 5 road map to reflect the actual tasks that will be
completed during the current development cycle.
Add version 6 road map and add tasks not completed from the version
5 road map and the general road map.