Reorganize SQLite data files

- Add episode data structure (#9)
- Add fields for chapters (#6) and transcripts (#8)
- Add fields for medium (#3), funding (#7), and GUID (#4)
- Fix RethinkDB restore problems (#10)
- Save custom feeds in SQLite (#11)

src/MyWebLog.Domain/ViewModels.fs

@@ -300,6 +300,11 @@ type EditCustomFeedModel =
                         explicit          = ExplicitRating.parse this.explicit
                         defaultMediaType  = noneIfBlank this.defaultMediaType
                         mediaBaseUrl      = noneIfBlank this.mediaBaseUrl
+                        // TODO: implement UI to update these
+                        guid              = None
+                        fundingUrl        = None
+                        fundingText       = None
+                        medium            = None
                     }
                 else
                     None