SqlHelper Refactoring

Refactored umbraco.BusinessLogic.Log

- AddSynced(LogTypes,Int32,Int32,String)
- CleanLogs(Int32)
- GetAuditLogItems(Int32)
- GetLogItems(Int32)
- GetLogItems(LogTypes,DateTime)
- GetLogItems(User,DateTime)
- GetLogItems(User,LogTypes,DateTime)