Track moves in the database, valid and invalid

[James-Quigley]

• Adds a "Move" schema to mongo
• Adds a saveMove function to the datalayer
• Updates places where moves are made to call the new datalayer function

[chuckdries]

@James-Quigley looks like we're tracking bot moves. I think if we're going to do that we should at least flag them as such so we can tell them from human moves

[James-Quigley]

@chuckdries this just counts the total number of times a word has been played. In theory this is actually duplicate data since that would be present in each Game object.

But I could separate it out and have a human play count and a bot play count.

Really this is just for analytics