Improve UUID handling
Fix xml_string_writer
Add SaveToFile function for later use
Fix base::multimap bug
Add content_length and current_length accessors
Fix optional data bug
Add new service manager and MyAnimeList as a service
Add new HTTP client and manager, separate UI code
Add new sync functions, move and update announce.*
Edit Database::SaveList and Database::LoadList
Connect Feed to HttpManager
Connect UpdateHelper to HttpManager
Fix namespaces and other remaining issues