Experimenters create new item types: 5pts

[skleinfeldt]

User story

As an experimenter I can specify a new kind of object that can appear on the map. It will have a unique ID, an icon to represent it, caloric value (non-zero makes it a food object), spawn rate, whether you can walk over/through it, whether it is interactive (yes/no - as opposed to immediately consumed like current GU), and how many times it can be consumed or used.

TODO

• Change food properties to general object properties.
• Replace the Food class with an Object class.
• Refactor all code that uses food properties to take objects into account.
• Change send grid info to send object data according to specification defined on Participants see items: 8pts #233.
• Decide what to do about bots, since base GU bot's strategy is based on food.
• Simplify game instructions
• Get tests passing

Client/Server data spec

Grid serialization, including new representation of Food:

{
    "type": "state",
    "grid":
        {
            "players": [],
            "round": 0,
            "donation_active": false,
            "rows": 25,
            "columns": 25,
            "walls": [],
            "objects": [
                {
                    "id": 0,
                    "type_id": 1,
                    "position": [13, 14],
                    "maturity": 1.0,
                    "color": [0.54, 0.61, 0.06]
                },
                {
                    "id": 1,
                    "type_id": 1,
                    "position": [23, 16],
                    "maturity": 1.0,
                    "color": [0.54, 0.61, 0.06]
                },
                {
                    "id": 2,
                    "type_id": 1,
                    "position": [21, 0],
                    "maturity": 1.0,
                    "color": [0.54, 0.61, 0.06]
                },
                {
                    "id": 3,
                    "type_id": 1,
                    "position": [5, 11],
                    "maturity": 1.0,
                    "color": [0.54, 0.61, 0.06]
                },
            ]
        }
    }
}

[alecpm]

@cguardia see my note on #240 regarding how we can generalize food properties into object properties specifically as it relates to spawning objects/food.

[cguardia]

Note that it was decided that bots will not be touched as part of this ticket.