Fix #1969 #1818

Cause: process's additional environment variables are not expanded
by correctly.

Innovated by studentmain (StudentEx <scncgz@gmail.com>)

section Global Hotkeys

Removed redundant method call

修复ConfigForm不安全代码。链接分隔符支持空格。

Auto register hotkeys

* Update LogForm.cs
* Update ja.txt
* Update zh_CN.txt
* Update zh_TW.txt
* Update the control name

* Referenced from project `rg3/youtube-dl` with necessary modifications

- Naming
- Cleanup
- Move logic to controller

- Portable mode ON: executable file's folder
- Portable mode OFF: current user's temp folder

* Translation
* Environment Variables support

Add plugin CLI arguments support

* Add tooltips
* Translations

- Add section "Open Source Components / Libraries"
- Other minor changes

[Fix] QRCodeSplashForm.cs无法在窗体设计工具中打开

Update zh_TW.txt

change some translations

Move PerPixelAlphaForm's code into QRCodeSplashForm to avoid 2 derived class of Form in same file.

Before: QRCodeSplashForm -> PerPixelAlphaForm -> Form
After: QRCodeSplashForm -> Form

Server address should not be encoded

Because the splash is already on the target display, the target rect doesn't need to calculate with the screen position.

"Allow Clients from LAN" --> "Allow other Devices to connect"

add official way to dump network tracing info

just uncomment the specific node in app.config, no need to recompile
to take effect. It will be shipped as Shadowsocks.exe.config after built.

This is for debugging only.

add xchacha20-ietf-poly1305

- update mbedtls to 2.7.0, use new md5 api
- update libsodium to 1.0.16
- static link to openssl 1.1.0g, check libsscrypto repo for detail