Yeah, there was little emphasis on continuity, Fox needed a Feige.
I was talking about Jean, but now that you mention it, yes, Raven died in 1992 in the post-DOFP revised "new" timeline. ( Also, that was the fourth movie in the First Class continuity, not the third. )
It's starting to look like the X-Men who turn up in Avengers will be from a universe in which the first three X-Men films ( or their equivalents ) happened but DOFP did not. Or they could be from a point in the "original" timeline prior to 2023, if that's an option.