Push API changes

* Fix item repair cost formula
* Add "RequestUpdateAvailableFreeLoadout" function (WIP)
* Fix item sell formula
* Fix item stack split on sell
* Fix contract progression counting for objectives other than owned items
* Refactor balance into a proper struct
* Separate and update Season 2 and Season 3 data

src/Prospect.Server.Api/Services/CloudScript/Functions/RequestUpdateSeasonWipeData.cs

@@ -9,9 +9,9 @@ public class RequestUpdateSeasonWipeDataRequest
 public class RequestUpdateSeasonWipeDataResponse
 {
     [JsonPropertyName("userId")]
-	public string UserId;
+	public string UserId { get; set; }
     [JsonPropertyName("error")]
-	public string Error;
+	public string Error { get; set; }
 }
 
 [CloudScriptFunction("RequestUpdateSeasonWipeData")]