freeciv: Clean out appdata directory

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
freeciv: Move common download URL to freeciv.inc

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
freeciv: Add 2.5.0-beta1

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>