SwivelPoint

# Feature Overview
Kind: Swivel / Rotation Point
Extendable: no
JSON based: no
JSON config: yes

Swivel (or Rotation) Point is a new feature added in FVTM 3.3.x!
It allows to define rotable (and translate-able) "spots" on your vehicle, and you
can assign seats, attributes and parts to it!
They will render/move/work accordingly to the point's position and rotation.

New Swivel/Rotation points can be added to a vehicle via the Vehicle Config directly or Part Configs.

Here a list of current fields a swivel/rotation point config object should/can contain:

• id - unique id of the point, make sure to have no duplicates and also do not
  call it "vehicle", that one is reserved for the vehicle itself!
• parent - id of the parent point, if left out it defaults to the vehicle
• pos - the initial position of the point, relatively to it's parent, JSON Array
• yaw - optional, initial "yaw" of the point*
• pitch - optional, initial "pitch" of the point*
• roll - optional, initial "roll" of the point*,
• movers - optional, json object OR json array with a list of "movers", example:

  "movers":{
    "custom_attribute_id":"axis",  //simple automatic mover aligning the specific axis to the attribute value
    "control_lever_20":"x",
    "steering_lever_12": "yaw",
    "class": "com.mypackage.mypack.CustomMover.class",  //reference a custom mover implementation
  }
  OR
  "movers":[
    {
      "attribute": "custom_attr_19",
      "var": "y",
      "speed": 0.25 // alignment speed, only avaible when using this config type
    },
    {
      "attribute": "custom_attr_20",
      "var": "yaw",
      "speed": 0.1, // alignment speed, only avaible when using this config type
      "bool_based": true, //when using a tri-state or boolean attribute
      "min": -120,
      "max": 150,
      "def": 20, //default state when the mover is first activated
      "loop": false //if the mover should go to max when reaching min, or the other way around
    },
    {
      "class": "net.somepack.movers.MyCustomMover.class",
      "mydata": 1212323,
      "other": false, // custom data for the custom class
      "some_other": 23.5
    }
  ]

* = feature still in testing/adjustment, values subject to change