Allow specifying request headers in RasterOverlayOptions
#1076
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Fixes #1067. This is a companion to #1057, applying a similar change to raster overlays. One wrinkle in the implementation is that some raster overlays already accept headers in their constructor. Not only would it be best to avoid changing the public API, but
IonRasterOverlay
in particular relies on this functionality being present so it can pass theAuthorization
header to the underlyingTileMapServiceRasterOverlay
. To support this, I've added amergeHeaders
method that allows the headers specified in the constructor to override any headers with the same name specified in theRasterOverlayOptions
.