support multi-episode files in local libraries (#240)

* add unused episode nfo reader

* move episode number from episode to episode metadata

* first pass at loading multi-episode metadata from nfo files

* fix episode scanning

* local multi-part episode fixes

* code cleanup

ErsatzTV.Infrastructure/Migrations/20210603013933_Add_EpisodeMetadataEpisodeNumber.cs

@@ -0,0 +1,24 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_EpisodeMetadataEpisodeNumber : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "EpisodeNumber",
+                table: "EpisodeMetadata",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "EpisodeNumber",
+                table: "EpisodeMetadata");
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210603014211_Update_EpisodeMetadataEpisodeNumber.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Update_EpisodeMetadataEpisodeNumber : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql(
+                @"UPDATE EpisodeMetadata SET EpisodeNumber = (SELECT EpisodeNumber FROM Episode WHERE Id = EpisodeMetadata.EpisodeId)");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/20210603015235_Remove_EpisodeEpisodeNumber.cs

@@ -0,0 +1,24 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Remove_EpisodeEpisodeNumber : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "EpisodeNumber",
+                table: "Episode");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "EpisodeNumber",
+                table: "Episode",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -348,6 +348,9 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Property<int>("EpisodeId")
                         .HasColumnType("INTEGER");
 
+                    b.Property<int>("EpisodeNumber")
+                        .HasColumnType("INTEGER");
+
                     b.Property<int>("MetadataKind")
                         .HasColumnType("INTEGER");
 
@@ -1421,9 +1424,6 @@ namespace ErsatzTV.Infrastructure.Migrations
                 {
                     b.HasBaseType("ErsatzTV.Core.Domain.MediaItem");
 
-                    b.Property<int>("EpisodeNumber")
-                        .HasColumnType("INTEGER");
-
                     b.Property<int>("SeasonId")
                         .HasColumnType("INTEGER");