build script: implemented --ignore-uncommitted
build-script: Use `git clean` rather than "make deb-cleanup" for better security. It is also faster.
build-script: No longer use `sort` in cleanup step for better security.
build-script: No longer automatically clean up before package building.
build script: Now supports ./whonix_build --tor-gateway --tor-workstation -- --build --vbox --qcow2 etc.
moved whonix_build to help-steps/whonix_build_one
renamed whonix_build_all to whonix_build