sets the header label and default params for new headers
| hdrStr | string | a header string with delimiters | 
| splitSign | string | a string used as a split marker, optional. Default is "#cspan" | 
| styles | array | an array of header styles | 
// setting columns' labels
mygrid.setHeader("A,B,C");
// setting columns' labels and their styles
mygrid.setHeader(
    "A,B,C",
    null,
    ["text-align:right;","text-align:left;","text-align:center"]
);
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