- This prevents the "no available updates" pop-up from showing up when it's an automatic check. Thank you @chenshaoju for your feedback.
- Checking pre-release checks in the menu would work on the current run now.

- Infrastructure: use one HttpClient instance throughout the lifecycle
- Version update: rewrite the update service and add update prompt window
- Server sharing: add copy link button
- Dependencies: add ReactiveUI.Events.WPF, ReactiveUI.Fody, ReactiveUI.Validation, WPFLocalizeExtension, MdXaml

- Configuration: geositeDirectGroups + geositeProxiedGroups + geositePreferDirect
- PAC: rule generation using these new groups + cleanup

- Validate geosite group configuration
- Reset to default if specified group doesn't exist
- Regenerate pac.txt on version update (can be turned off)
- Cleanup of `Configuration` to separate loading logic and processing logic

- Fixes #2986

- Remove StringEx.CS
- Update all dependencies
- Eliminate all warnings

- For OnlineConfigResolver and GeositeUpdater

Signed-off-by: Beta Soft <betaxab@gmail.com>

- PAC proxied list only contains domain names from geolocation-!cn without a `cn` attribute

- HttpClientHandler is not used in .NET Core 3+

proposed by Stzx

# Conflicts:
#	shadowsocks-csharp/Controller/Service/UpdateChecker.cs
#	shadowsocks-csharp/Controller/System/ProtocolHandler.cs
#	shadowsocks-csharp/Program.cs
#	shadowsocks-csharp/packages.config
#	shadowsocks-csharp/shadowsocks-csharp.csproj

Always sip002

- Compared to 2c15276: changed socketsHttpHandler to HttpClientHandler due to legacy .NET Framework
- Use System.Net.Http.HttpClient for GeositeUpdater
- New update check mechanism: first download checksum and compare, only download GeoSite DB on different checksum
- Verifiy downloaded GeoSite DB by comparing sha256sum before committing the change

- Use System.Net.Http.HttpClient for GeositeUpdater
- New update check mechanism: first download checksum and compare, only download GeoSite DB on different checksum
- Verifiy downloaded GeoSite DB by comparing sha256sum before committing the change

# Conflicts:
#	appveyor.yml
#	shadowsocks-csharp/Controller/Service/TCPRelay.cs
#	shadowsocks-csharp/Program.cs
#	shadowsocks-csharp/Properties/Resources.Designer.cs
#	shadowsocks-csharp/View/MenuViewController.cs
#	shadowsocks-csharp/packages.config
#	shadowsocks-csharp/shadowsocks-csharp.csproj

in case gfwlist no longer update