implement PkgrStow, PkgrUnstow
implement PkgrStow, PkgrUnstow

stow uncooperative plugins
- e.g.
  - Olical/conjure
  - guns/vim-sexp
- i.e.
  - plugins which
    - don't work if not found in the vim 8 package start directory
    - are
      - e.g.
        - too large
        - too specialized
      - to justify being in the vim 8 package start directory normally
- in ~/.vim/pack/packager/stow

atweiden/pacfiles,atweiden/pacfiles