install: begin rework

ModpackUpdater.Model/InstallInfos.vb

@@ -0,0 +1,11 @@
+Imports Newtonsoft.Json
+
+Public Class InstallInfos
+
+    Public ReadOnly Property Actions As New List(Of InstallAction)
+
+    Public Shared Function Parse(content As String) As InstallInfos
+        Return JsonConvert.DeserializeObject(Of InstallInfos)(content)
+    End Function
+
+End Class