bump 2.5.8

Update GFWList URL

Release/2.5.7

no repeat random number generator by GangZhuo

The stock code use class Random to generate IV, the Random is pseudo random number generator. The IV maybe repeat, this will cause shadowsocks-libev closed the sockets with the error message 'invalid password or cipher'. Reference https://github.com/shadowsocks/shadowsocks-libev/issues/389

Solution is use class RNGCryptoServiceProvider to generate IV, of course it's lower performance, but a little bit.

Fix a tiny bug

Sometimes the users may hit enter key by mistake, and the form will
close without saving entries.

Add more clear log for exceptions occured in ICMP tests

improved `log viewer` windows

1. add `clean log` feature
2. add `change font` feature
3. add `wrap text` feature
4. add `top most` feature

2 fixes, 1 feature, 1 code beautify

1/ removed dual empty line
2/ removed tailing spaces
3/ converted tabs into spaces
4/ added some TODO comments

support customize the server order

Update UpdateChecker.cs

Update UpdateURL

hotfix/PingException