JOSIANE KOUAGHEU A court in Cameroon has sentenced four people to death for their roles in a shooting attack on a school last year that killed seven children and wounded 12 others, according to a court document seen by Reuters on Wednesday. A military court in Buea, the capital of Cameroon's South West region, found the men guilty of terrorism, assassination, and attempted secession, according to its judgment, which was issued on Tuesday. The men were sentenced to execution by firing squad in the town square, but their sentences are likely to be converted to life imprisonment. Cameroon has not…