Add missing PresenceStatus type

userapi/types/presence_string.go

@@ -0,0 +1,27 @@
+// Code generated by "stringer -type=PresenceStatus -output=presence_string.go -linecomment"; DO NOT EDIT.
+
+package types
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[Unknown - -1]
+	_ = x[Online-0]
+	_ = x[Offline-1]
+	_ = x[Unavailable-2]
+}
+
+const _PresenceStatus_name = "unknownonlineofflineunavailable"
+
+var _PresenceStatus_index = [...]uint8{0, 7, 13, 20, 31}
+
+func (i PresenceStatus) String() string {
+	i -= -1
+	if i < 0 || i >= PresenceStatus(len(_PresenceStatus_index)-1) {
+		return "PresenceStatus(" + strconv.FormatInt(int64(i+-1), 10) + ")"
+	}
+	return _PresenceStatus_name[_PresenceStatus_index[i]:_PresenceStatus_index[i+1]]
+}