Added station presence column and bumped up version

- Added a StationStatus "presence" property to TrainStatusRow and display it as a new (unnamed) TableColumn in ContentView (using presence.rawValue).
- Populated presence from leg?.status.
- Bumped app version to 0.2.103 in Bundler.toml and add a 0.2.103 entry to changelog noting the new column.

Sources/AmtrakStatus/Models.swift

@@ -103,5 +103,5 @@ struct TrainStatusRow: Identifiable {
     var departure: String
     var origin: String
     var destination: String
-    // var serviceDate: String
+    var presence: StationStatus
 }