Wrap the specific functions that expect arrays with the corresponding Julia type

[JamieMair]

Create autogenerated code which creates a specialised function call for each mj_ function that takes in a pointer to an array. This will allow users to benefit from Julia's built-in array support. It would also remove the need for users to keep track of array sizes.

[JamieMair]

This will likely require knowing exactly what inputs to use for all the functions - for now, we will document how to create and use row-major arrays to be passed into the mujoco functions.

[JamieMair]

Make sure the optional types in the method signature are obvious