Move database context, migrations and models to separate project.

Aaru.Server.Database/Migrations/20200710184810_AddCanReadGdRomUsingSwapDisc.cs

@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Aaru.Server.Database.Migrations
+{
+    public partial class AddCanReadGdRomUsingSwapDisc : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.AddColumn<bool>("CanReadGdRomUsingSwapDisc", "Devices", nullable: true,
+                                             defaultValue: null);
+
+        protected override void Down(MigrationBuilder migrationBuilder) =>
+            migrationBuilder.DropColumn("CanReadGdRomUsingSwapDisc", "Devices");
+    }
+}