Add backgorunds to games

gameUtils/gameTypes.go

@@ -13,6 +13,11 @@ type GameInterfaceAssets struct {
 	Title       string
 	Icon        string
 	Description string
+	Backgrounds []GameInterfaceBackground
+}
+
+type GameInterfaceBackground struct {
+	File string
 }
 
 type Games struct {
@@ -27,6 +32,6 @@ type JSGameInterface struct {
 }
 
 type Argument struct {
-	Body  string `json:"body"`
+	Body  string
-	Value string `json:"value"`
+	Value string
 }