SteamKit 2.5.0-Beta.1

• Added SteamApps.GetLegacyGameKey. (#1071)
• Added SteamUser.PlayingSessionStateCallback. (#1109)
• Added ability to serialize depot manifests. (#1113)
• Added support for unauthenticated service methods. (#1126)
• Added LogOnDetails.MachineName. (#1183)
• Added support for new Steam authentication system. (#1129)
• Improved TCP connection reliability. (#1102)
• Update enums and protobufs. (#1073, #1120, #1126, #1148, #1184, #1203)

Bug Fixes

• Fixed nullability annotations on PersonaStateCallback. (#1067)
• Fixed sending service method notifications. (#1075)