Move generics to their own file

wow/gamedata/generics.go

@@ -0,0 +1,20 @@
+package gamedata
+
+const (
+	UP   string = "UP"
+	DOWN string = "DOWN"
+)
+
+type href struct {
+	Href string `json:"href"`
+}
+
+type idAndKey struct {
+	ID  int  `json:"id"`
+	Key href `json:"key"`
+}
+
+type idAndType struct {
+	ID   int    `json:"id"`
+	Type string `json:"type"`
+}