[Freeciv-Dev] (PR#3928) Convert client to use PF

["Raimar Falke" <rf13@xxxxxxxxxxxxxxxxx>]

The attached patch removes large parts of client/goto.c. Remaining are
the waypoint, packet and drawn handling.

Open issues are:
 - the network interface doesn't support dangerous tiles
 - the path execution at the server doesn't support dangerous tiles
 - the network interface is quite weird (for example it divides the
 path into 20-positions chunks while a chunk could holds 1500/2=750
 positions)
 - I had to add ../common/pqueue.o by hand. The reason for this is
 unknown.

Except because of the last point the attached patch should be applied.

Gregory: I implemented this

  struct pf_path *pft_concat(struct pf_path *dest_path,
                             const struct pf_path *src_path);

But it isn't a true concat because it removes the duplicated and
overlapping opsitions.

        Raimar

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