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Change spatial model default frame to icrs #2385
This PR changes the spatial model default frame from "galactic" to "icrs".
Using ICRS is much more common in astronomy, Galactic frame is more exotic, that was introduced just because the Gammapy devs do Galactic science.
Putting "icrs" gives consistency with SkyCoord and Map.
@adonath - Could you please fix this reference file?