aisleriot: Change licence to GPL 3+
Relicence the libgamescard library code from LGPL 2+ to LGPL 3+ (resp. GPL 2+ to GPL 3+), and aisleriot from GPL 2+ to GPL 3+. The libgamescards licence changes also implies a blackjack licence change from GPL 2+ to GPL 3+. Add COPYING.GPL3 containing the text of the GPL version 3, and COPYING.README with a short summary of which code is licensed how.
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