Component: Elevator
=================
This component can be accessed by connecting an Elevator Control to a Computer.

Component name: `elevator`.  
Callbacks:

- `call(floor:number):boolean`  
  Tries to call the elevator to a certain floor. Returns `true` on success, `false` and an error message otherwise.
- `isReady():boolean`  
  Returns `true` if the elevator can be called, `false` if it can not (because it is already moving).
- `getLocalFloor():number`  
  Returns the number of the floor the currently accessed Elevator Control is set to.
- `getElevatorFloor():number`  
  Returns the number of the floor the elevator is currently at. If the elevator is moving, the function returns the destination floor as its second argument.
- `doesFloorExist(floor:number):boolean`  
  Returns `true` if the floor exists and thus can be called; the function returns `false` if the floor does not exist.

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