install: begin rework

ModpackUpdater.Model/ModpackConfig.vb

@@ -0,0 +1,15 @@
+Imports System.Net.Http
+
+Imports Newtonsoft.Json
+
+Public Class ModpackConfig
+
+    Public Property UpdateUrl As String
+    Public Property InstallUrl As String
+
+    Public Shared Function LoadFromUrl(url As String)
+        Dim result As String = New HttpClient().GetStringAsync(url).Result
+        Return JsonConvert.DeserializeObject(Of ModpackConfig)(result)
+    End Function
+
+End Class