package/qprint: new package

package/qprint: new package

qprint is a small utility that handles encoding and decoding arbitrary
binary data in the Quoted-Printable format, which was introduced along
MIME.

As stated in the package description, although MUAs nowadays usually
take care of doing this encoding themselves, there are some use cases
where doing it manually is needed, and providing a command-line program
to do it is amenable to shell scripts.

Signed-off-by: Alejandro González <alejandro.gonzalez.correo@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>