Added experimental Autostart feature to Yakuake.

This Autostart feature consists on a KEditListBox in which users can insert
what sessions (order, quantity and name) they want to be loaded on startup.

Problems:
    KEditListBox behaviour is weird, as it always inserts at the beginning.

Not yet supported:
    Sessions with multiple terminals (and dispositions);
    Running commands on statup per terminal;
    Session save and restore instead of manual definition;
    So many others.

Forked from: git://anongit.kde.org/yakuake
Maintainer : Eike Hein