Waf: Add top-level wscript and rtems_waf module to support waf builds.
hello: Add support to build with waf.

Add wscript support for building hello/hello_world_c with waf.
Add LICENSE.2 with 2-clause BSD. Point to it from 2-clause BSD licensed files.
hello: get CFLAGS from environment in wscript
filesystem: initial attempt at waf conversion
filesystem: Update wscript. compiles now to make it better
filesystem: minor fixes
Add a git ignore file.
Fix rtems.py's filtering of BSPs.

Update the BSP filtering in the RTEMS waf support.
Break the flags down even more to allow users to manage what they use in
applications.
Add rtems-bin2c to the list of checked tools.
rtems.py: add tweak for gc-sections link flag
waf: add optimization and debug flags to top-level wscript
hello: simplify wscript and fix authorship copyrights
Added wscript to clasic_api directory
added wscript to triple_period and classic_signal subdirs
fixed comments in triple_period/wscript
added wscript to file_io and subdirectories
Convert gdb example to use Waf.
Convert ticker example to use Waf.
Convert uboot example to use Waf.
Convert led/timer example to Waf.