/// <summary>
/// Draw an editable float field.
/// </summary>
/// <param name="value"> </param>
/// <param name="hidden">Whether to replace the value with a dash</param>
/// <param name="greyedOut">Whether the value should be greyed out or not</param>
/// <param name="name"> </param>
/// <param name="opt"> </param>
static bool FloatField (string name, ref float value, bool hidden, bool greyedOut, GUILayoutOption opt)