Rename template.go to format.go, a table's tokens to cellTemplates, drawAt.alt to pinned and ftoken's brace-body kind to 't', and drop the done item

family.go

@@ -219,4 +219,4 @@ func checkOwnFamily(t *template) error {
 // alternatives reports whether two reads sit in different rows of one table: rows the walks pinned,
 // or rows of one whole draw.
 // docs/decisions.md#the-rows-of-a-table-are-alternatives
-func alternatives(a, b drawAt) bool { return a.alt.differs(&b.alt) || a.whole.differs(&b.whole) }
+func alternatives(a, b drawAt) bool { return a.pinned.differs(&b.pinned) || a.whole.differs(&b.whole) }