Add *abrupt* phantom tic-tac-toe

[nathanlct]

This adds an abrupt variant to the Phantom TTT game, where playing on a non-empty cell stops the player's turn.

I copied the Dark Hex implementation which offers a choice between the classical or abrupt version of the game.

[lanctot]

Regarding the failing tests: seems like a new issue in Dark Hex is causing a compilation problem that wasn't happening before.

I am on vacation at the moment but will take a look when I get back. Once we fix it you can just pull the changes from master and retrigger the tests.

[lanctot]

Regarding the failing tests: seems like a new issue in Dark Hex is causing a compilation problem that wasn't happening before.

I am on vacation at the moment but will take a look when I get back. Once we fix it you can just pull the changes from master and retrigger the tests.

Ok, this fix has been merged into master. Can you pull changes from master and push the merge commit to trigger the tests again?

[nathanlct]

Thanks Marc! I rebased my branch to the latest master, should be good to go.

[lanctot]

Ok, the new failure looks legit.

Did you modify the playthroughs manually (seems like some places were not updated)? If so, try to regenerate them using this script instead: https://github.com/google-deepmind/open_spiel/blob/master/open_spiel/scripts/regenerate_playthroughs.sh