A new GUI front-end based on GTK+3 has been added. It exposes a subset
of the operations availables from the CLI command and from the library.
The UU encoding and decoding algorithms has been implemented inside the
library. This allowed to drop the dependency on GMime.
The custom log functions have been dropped in favor of a new approach
based on the GLib loggin system. This allows more flexibility with
less code.
A basic framework based on what provided by autotools has been added.
Encoding/decoding and debugging functions are now tested.
