Woof ce updates

Contains changes from github.com/puppylinux-woof-CE/Pkg:

- updated to 1.9.23
- updated /etc/pkg/sources-all and ~/.pkg/sources-all
  - removed outdated repos
  - fixed some slackware related repo entries
- updated PKG_NAME_ALIASES
- updated repo-update routines:
  - support for newer 0setup
  - ADDED: backwards compatibility with older 0setup versions
- fixes in Gpkgdialog
- removed outdated buildpet build scripts
- improvements to package tarball unpacking/installation
- use latest SFS Loader and download_file scripts
- remove multi-arch symlink stuff
  - this change potentially breaks Pkg in most Puppies
    built before Decemeber 2019
- various code clean ups