use blurhash for song backgrounds (#526)

* generate blurhash for all local artwork

* use blurhash song background if available

* only write blur hash to disk once

* use multiple blur hashes

* update changelog

* fix song detail outline

* reset song metadata (artwork)

ErsatzTV.Infrastructure/Migrations/20211203040447_Add_ArtworkBlurHash.cs

@@ -0,0 +1,25 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_ArtworkBlurHash : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "BlurHash",
+                table: "Artwork",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "BlurHash",
+                table: "Artwork");
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/20211203174753_Add_MoreArtworkBlurHashes.cs

@@ -0,0 +1,45 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Add_MoreArtworkBlurHashes : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.RenameColumn(
+                name: "BlurHash",
+                table: "Artwork",
+                newName: "BlurHash64");
+
+            migrationBuilder.AddColumn<string>(
+                name: "BlurHash43",
+                table: "Artwork",
+                type: "TEXT",
+                nullable: true);
+
+            migrationBuilder.AddColumn<string>(
+                name: "BlurHash54",
+                table: "Artwork",
+                type: "TEXT",
+                nullable: true);
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "BlurHash43",
+                table: "Artwork");
+
+            migrationBuilder.DropColumn(
+                name: "BlurHash54",
+                table: "Artwork");
+
+            migrationBuilder.RenameColumn(
+                name: "BlurHash64",
+                table: "Artwork",
+                newName: "BlurHash");
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/20211203182334_Reset_SongMetadataBlurHash.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace ErsatzTV.Infrastructure.Migrations
+{
+    public partial class Reset_SongMetadataBlurHash : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.Sql(
+                @"UPDATE LibraryPath SET LastScan = '0001-01-01 00:00:00' WHERE Id IN
+                (SELECT LP.Id FROM LibraryPath LP INNER JOIN Library L on L.Id = LP.LibraryId WHERE MediaKind = 5)");
+
+            migrationBuilder.Sql(
+                @"UPDATE Library SET LastScan = '0001-01-01 00:00:00' WHERE MediaKind = 5");
+
+            migrationBuilder.Sql(
+                @"UPDATE Artwork SET DateUpdated = '0001-01-01 00:00:00' WHERE SongMetadataId IS NOT NULL");
+            
+            migrationBuilder.Sql(
+                @"UPDATE LibraryFolder SET Etag = NULL WHERE Id IN
+                (SELECT LF.Id FROM LibraryFolder LF INNER JOIN LibraryPath LP on LF.LibraryPathId = LP.Id INNER JOIN Library L on LP.LibraryId = L.Id WHERE MediaKind = 5)");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}

ErsatzTV.Infrastructure/Migrations/TvContextModelSnapshot.cs

@@ -144,6 +144,15 @@ namespace ErsatzTV.Infrastructure.Migrations
                     b.Property<int>("ArtworkKind")
                         .HasColumnType("INTEGER");
 
+                    b.Property<string>("BlurHash43")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("BlurHash54")
+                        .HasColumnType("TEXT");
+
+                    b.Property<string>("BlurHash64")
+                        .HasColumnType("TEXT");
+
                     b.Property<int?>("ChannelId")
                         .HasColumnType("INTEGER");