- Backup the original appveyor.yml as appveyor.yml.obsolete
- Fetch an official appveyor sample file as reference
- Create a test scope appveyor pipeline

- Redirect the nuget \3rd folder to ..\packages folder as default by
  remove the nuget.config file
- Update csproj file: remove unnecessary scripts for old nuget
  packages on old .Net framework
- Upgrade nuget packages to .Net framework 4.7.2 as the target framework
- Downgrade Fody to 4.2.1. The 5.0.0+ requires MSBuild 16 and above

Microsoft Docs is misleading, as always. dotnet/samples#1644

Directly create a WebProxy with IPAddress.IPv6Loopback.ToString() throws UriFormatException. Format the proxy host name to satisfy WebProxy.

(cherry picked from commit 084b6fe72c)

FIX: some crash about thread-safe in statistics

[fixes #2542] Fix accidental index invalidation

Fixed an invalid index that was unexpectedly caused when the configuration was abandoned, resulting in an list box index exception.

Refine PAC server

- Uncompress the text file for better version control
- Touch the PAC files in first place

- Split the file operations to new PACDaemon
- More precise matching logic for handling PAC content http request

Modify PAC request behavior

Update the PAC file using the proxy channel only when proxy mode is enabled.

#2480 #1004

Fix shadowsocks/shadowsocks-windows/#2458

* Fix shadowsocks/shadowsocks-windows/#2458

* Servers List Box position adjustment is consistent with the v4.1.6 version

Add Experimental.md

issue_template: ask users to delete the instruction text

Support Windows 10 1903 Light Theme

留着每次读起来都很蛋疼，让用户看完就删了吧。

When launch from test framework, the Application.StartupPath looks like "C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\COMMUNITY\COMMON7\IDE\EXTENSIONS\TESTPLATFORM" which may not have write permission.

Support local IPv6 listener

# Conflicts:
#	shadowsocks-csharp/Model/Configuration.cs

Turn off per-monitor DPI awareness as it is not supported

Fixed bug of #2379 pullrequestreview-254461303
Redundant paintings when user move mouse on the icon, pixel by pixel.

Refactoring Config Form

Upgrade appveyor image to Visual Studio 2017