Sets the corresponding element to the parameter value passed in. Checks against the grid size constraints beforehand and throws RangeError if outside of constraints. Preferred method to set
element via coordinates.
Calculates the 2-D array coordinates from the corresponding list index passed in. Relies on grid width to calculate coordinates. Does not check against grid size constraints.
can be used to get the correct index from coordinates passed in. Will only calculate the index, not take into consideration any grid size constraints etc.
