Improve computer AI

So as much benefit as I get from it I still hate it. The computer especially for raids is just dumb.

It needs at a minimum improved at least to not target ghosted/ reviving heroes when other targets are possible and to not hit a corner hero with a special that hits target or nearby if there is a chance it can hit 3 instead.

I know the adjustment may be harder to make computer learn who is biggest threat and to synergise a correct firing pattern if more than one special ready. But the other stuff should be possible.