Removes Fool Me Forever

[Nikoleta-v3]

Hello everyone,

While working on one of my projects I realised that the strategy Fool Me Forever, which is an original strategy implemented within the library, is actually the same as the strategy EasyGo from
Prison1998 and Li2011.

Source code for Fool me Forever (link to source code here):

    @staticmethod
    def strategy(opponent: Player) -> Action:
        if opponent.defections > 0:
            return C
        return D

Source code for EasyGo (link to source code here):

    @staticmethod
    def strategy(opponent: Player) -> Action:
        """Begins by playing D, then plays C for the remaining rounds if the
        opponent ever plays D."""
        if opponent.defections:
            return C
        return D

The code snippets, the Ashlock fingerprints for both strategies and their performance in the Axelrod-Python standard tournament (result csv: https://github.com/Axelrod-Python/tournament/blob/gh-pages/assets/std_summary.csv) are the same.

This pr removes Fool me Forever (because it's an original strategy), the imports and tests associated with it. Let me know if it's okay and if there is something I forgot to do 👍

[Nikoleta-v3]

I saw the failure 👍 fixing it now

[marcharper]

Nice catch :)

[marcharper]

Since we've mentioned FoolMeForever in our publications we should mark it as an alternative name for EasyGo in its docstring.

[drvinceknight]

Thanks @Nikoleta-v3 👍