Merge changes I2e5e7b51,I77914112,I8936d9d1,I63c8cf4f,I0a02eb43, ...
* changes:
gn2bp: properly forward genrule dependency
gn2bp: remove script from sources
gn2bp: fix script location
gn2bp: do not skip //buildtools and buildflag generation
gn2bp: override deps before soong target is created
gn2bp: start adding some verbose logging
gn2bp: ignore copy targets in create_modules_from_target
gn2bp: add basic action support
gn2bp: explicitly make tool_files a list
gn2bp: add basic parser support for copy and action_foreach rules
gn2bp: allow targets to depend on chromium's libc++ and libunwind