Problem: various packaging issues

- included files renamed to .inc to match CLASS specs
- added 'extra' element to project.xml to cover such files
- fixed MSVC, CMake, MinGW, Android, and autoconf generators
- fixed various generators for private header files (zgossip_msg)
- removed hardcoded 'czmq' in various generators
- removed hardcoded headers in various generators (use 'headers' element)
- updated builds/msvc list in Makefile.am
- checked that czmq tar file packages and builds correctly