Add a "global" package named "on-lisp"

This pull creates a package called `on-lisp` and reexports (using [cl-reexport](https://github.com/takagi/cl-reexport)) all symbols from all other packages, except packages with more than one version of a symbol, like 19, 24 and 25.

With this, one can say:
```lisp
(defpackage :my-package
  (:use cl)
  (:import-from on-lisp
                mapa-b
                symb
                with-gensyms
                while
                ...))
```
...instead of:
```lisp
(defpackage :my-package
  (:use cl)
  (:import-from on-lisp.04
                mapa-b
                symb)
  (:import-from on-lisp.11
                with-gensyms)
  (:import-from :on-lisp.07
                while)
  ...)
```