Implement the dice game Yacht

[gmweinberg]

Description

Implements Yacht (dice game similar to Yahtzee) for OpenSpiel.

Addresses #843 (Yacht from the list of requested games)

Implementation Details

• Supports 1-10 players

Testing

• All existing tests pass
• Added yacht_test.cc with coverage of game mechanics
• Verified with cpplint and build_and_run_tests.sh

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[lanctot]

Thanks @gmweinberg ! Can to sign the CLA?

[lanctot]

Thanks! Broken MacOS tests are on our side, some of them are no longer supported. I have a PR (#1405) in the works for fix them.