Revert "Swap to dapper and system.text.json for database backend"

This reverts commit d2065bfa1b.

src/NzbDrone.Core/Datastore/DbFactory.cs

@@ -1,5 +1,7 @@
 using System;
 using System.Data.SQLite;
+using Marr.Data;
+using Marr.Data.Reflection;
 using NLog;
 using NzbDrone.Common.Composition;
 using NzbDrone.Common.Disk;
@@ -29,6 +31,7 @@ namespace NzbDrone.Core.Datastore
         {
             InitializeEnvironment();
 
+            MapRepository.Instance.ReflectionStrategy = new SimpleReflectionStrategy();
             TableMapping.Map();
         }
 
@@ -95,11 +98,12 @@ namespace NzbDrone.Core.Datastore
 
             var db = new Database(migrationContext.MigrationType.ToString(), () =>
             {
-                var conn = SQLiteFactory.Instance.CreateConnection();
-                conn.ConnectionString = connectionString;
-                conn.Open();
+                var dataMapper = new DataMapper(SQLiteFactory.Instance, connectionString)
+                {
+                    SqlMode = SqlModes.Text,
+                };
 
-                return conn;
+                return dataMapper;
             });
 
             return db;