Added EarthSmash

Updated Methods.stopBending():
    Certain abilities were not having their removeAll() method called when the server shutdown.
    (AirCombo, LavaFlow, WaterWave, WaterCombo, FireCombo)
    
Added Earth Ability - EarthSmash:
    EarthSmash was previously an Addon ability that was downloadable from the resource page. It has now been recoded to work as a default ProjectKorra (Core) ability.
    Original Uses:
        Defensive
            - Can be used as a shield.
            - Blocks Watermanipulation, EarthBlast, FireBlast, Torrent (Stream), and IceSpike.
            Can't Block ShockWave, EarthGrab, Blaze, AirShield, AirBurst, Tornado, Torrent(AOE).
        Offensive
            - Can be shot as a projectile to hit multiple enemies.
            - Does moderate damage that scales based on how many blocks are attached to the center.
            - Travels fast and is harder to block than EarthBlast.
            - Can't be redirected like EarthBlast, making its travel path predictable.
        Mobility
            - Can be ridden for a few seconds, the duration is similar to FireJet.
            - Collision with walls and certain abilities will cause you to fall.​
        Misc
            - You can only create an EarthSmash if there is enough earthbendable material where you are pointing.
            - Other EarthBenders can steal your EarthSmash if you aren't grabbing or riding it.
            - EarthSmash can be ridden by multiple entities at a time.​
    New Changes:
        Defensive:
            - Even after an EarthSmash is shot, it can now be caught by another Earthbender if they press shift at the right time.
        Mobility:
            - You can now ride an EarthSmash by grabbing it with shift and right clicking one of the blocks.
    Config:
        AllowGrab: Allows the player to grab
        AllowShooting: Allows the player to shoot
        AllowFlight: Allows the player to fly
        GrabRange: The range that a player can grab by sneaking
        ChargeTime: The initial charge time to raise the ability
        Cooldown: The cooldown between raising, does not affect grab/shoot/flying
        ShotRange: The maximum range to shoot the ability
        Damage: The damage of the ability
        Knockback: The knockback force caused by being hit
        Knockup: The upward force caused by being hit
        FlightSpeed: The flight speed
        FlightTimer: The maximum amount of time that a player can fly
        RemoveTimer: The amount of time before the ability is auto destroyed
    Note: If an EarthBender takes damage from an EarthSmash they can still catch it with sneak as long as it hasn't disappeared. I'm not sure I want to keep or remove this.