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.

Added translation for "Statistics configuration" line.

First version of Russian translation.

Also update i18n

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

Support local IPv6 listener

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

Added Config Form hint text

When error code is SocketError.AccessDenied/10013(WSAEACCES), the port is reserved by system and you may not find the process name in `netstat`.
 https://github.com/shadowsocks/shadowsocks-windows/issues/1835#issuecomment-453528715

PAC will check the user rules first to find whether the URL should be connected via PROXY or DIRECT. If it does not match, then go to check GFWList rules.

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

binary modified via OD with tray icon function calls bypassed

Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Auto register hotkeys

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

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

* Translation
* Environment Variables support

* Add tooltips
* Translations

change some translations

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

- 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