- Corrects the mistake in 127cb96 and fixes #3013

- 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

proposed by Stzx

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

in case gfwlist no longer update

New option for ss:// URL association

Fixes https://github.com/shadowsocks/shadowsocks-windows/issues/2857