raw files, usually dng files, can provide a dcp profile by providing the
related tags.
This patch will make the "Use embedded" options in the color management
panel selectable if the source raw file embeds a dcp profile.
In this case the DCP panel will be enabled like when reading an external
dcp profile.
Additional changes:
* Rename "Use embedded, if possible" to just "Use embedded" since the
option is already disabled when no embedded profile is found.
* Update the "Use embedded" options tooltip as it's now not related to
only non raw images.
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