Add a context menu (right click) item for a target. Same as CustomContextMenu except:

1. When used on an array/list, it will work on every element of the array/list, instead of the array/list itself
2. When used on an array/list, the callback can optionaly addionally receive a index parameter
3. Does not require SaintsEditor
4. Only works on serializable field

using SaintsField;

[FieldCustomContextMenu(nameof(Func1), "Custom/Debug")]  // use like a CustomContextMenu
public int myInt;

[FieldCustomContextMenu(nameof(ClickItemRemover), "
quot; + nameof(ClickItemRemoverLabel))]
public List<string> lis;

private void ClickItemRemover(object _, int index)
{
    lis.RemoveAt(index);
}

private string ClickItemRemoverLabel(string value, int index) => 
quot;Delete {index}({value})";