- 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

- 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

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

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

drop sysproxy.exe in net-core version

also with some i18n update

target set to net core 3.1
managed cryptography implementation, drop x86 only
few modify to make new target working

Using NLog as the logger

No wrapper is used since we would use NLog for some time.
Currently the UI is not fully ready to select all log levels.

Fix #2782

https://github.com/shadowsocks/shadowsocks-windows/issues/2657

Support Windows 10 1903 Light Theme

But Fix Support Windows 10 1903 Dark Theme