Adds support for header_value
for export header
#970
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Summary
A potential solve for #947.
Adds a
header_value
property onColumn
andBoundColumn
, analogous to the currentheader
property. Then, adjustsas_values
to use theheader_value
property for export column headers. Theheader_value
property returnsheader
for backwards compatibility, but provides a way to customize export headers independently of headers in the html table view. This is important becauseheader
may include custom HTML that shouldn't be included in export formats.