Set in Jerusalem in 1981, Joseph Cedar’s “Campfire” focuses on a young widow trying secure a place for herself and her two adolescent daughters in one of Israel’s nascent West Bank settlements. Those expecting an overtly political or ideological film, however, are in for something very different. More than anything, “Campfire” is a personal and affecting exploration of the inevitable tension between the need for security and belonging, and our desire to forge our own path.