Expand the dat file ingestor to handle more formats (#84)

* MAME DAT's can now be imported, beginning of DB updates

* Fixed various database bugs that occur during upgrade from earlier versions

* Removed collation and MySQL specific options from database scripts

gaseous-server/Program.cs

@@ -1,6 +1,7 @@
 using System.Reflection;
 using System.Text.Json.Serialization;
 using gaseous_server;
+using gaseous_server.SignatureIngestors.XML;
 using gaseous_tools;
 using Microsoft.AspNetCore.Http.Features;
 using Microsoft.AspNetCore.Mvc;
@@ -146,6 +147,10 @@ gaseous_server.Classes.Metadata.Platforms.GetPlatform(0);
 // organise library
 //gaseous_server.Classes.ImportGame.OrganiseLibrary();
 
+// Migrate signature data if needed
+XMLIngestor ingestor = new XMLIngestor();
+ingestor.MigrateMetadatVersion();
+
 // add background tasks
 ProcessQueue.QueueItems.Add(new ProcessQueue.QueueItem(ProcessQueue.QueueItemType.SignatureIngestor, 60));
 ProcessQueue.QueueItems.Add(new ProcessQueue.QueueItem(