Weapons should support different shooting styles/animations

[zackthehuman]

Weapons like Metal Blade don't display the "arm cannon" animation, but instead show a "hand throwing" animation. Shield weapons usually just spawn without any animation at all.

Likely this can be a simple configuration inside of a weapon's definition. It could be expressed as a usageType where the possible values are cannon, thrown, or shield.

Other types could be supported if/when things like Top Spin or Charge Kick were to be supported.

    {
        "name": "MEGA BUSTER",
        "label": "M.BUSTER",
        "damageId": 7,
        "projectileType": "Plasma Shot",
        "limit": 3,
        "usageCost": 0,
        "usageType": "cannon",
        "usageSound": "Rockman (Shooting)",
        "usageActions": [
            {
                "type": "spawnProjectile",
                "projectileType": "Plasma Shot",
                "direction": "inherit",
                "motion": {
                    "type": "Linear",
                    "velocity": [0.0, 0.0]
                }
            }
        ]
    }

Even though weapons could be used by enemies as well as Rock, but the usageType is probably only really useful for Rock.

[zackthehuman]

This takes the place of #187.