Slight UI improvements, update build system In this new version, some simplifications have been made: - the DBus interaction, which I thought would be able to implement a server / daemon, is not the right tool because we cannot have two different names (because of flatpak) while we need to keep the GUI name; - the command-line interaction has been removed. The libtarot API is now sufficient so that we can only have easy ad-hoc processing programs and not rely on this interaction, while playing with /readline/ was a rather unpleasent experience anyways. The UI is slightly better: - the player can now create a new game; - the first player is not always the main player; - the player can send me her games so that I can update the AI :) - the AI has been slightly learnt so that it does not try to bid a double keep.