Import Json.Net since it's difficult for SimpleJson to deal with nested type.

Add more clear log for exceptions occured in ICMP tests

# Conflicts:
#	shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs

# Conflicts:
#	shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
#	shadowsocks-csharp/Controller/Strategy/StatisticsStrategy.cs
#	shadowsocks-csharp/View/LogForm.Designer.cs
#	shadowsocks-csharp/View/MenuViewController.cs

Note: This is a dirty hack.

2. store window's size & position in config file.
3. fix: scroll bar sometimes disappear while sizing the window.

1. WrapTextTrigger -> wrapTextTrigger
2. WrapTextTriggerLock -> wrapTextTriggerLock
3. TopMostTrigger -> topMostTrigger
4. TopMostTriggerLock -> topMostTriggerLock
5. ShowToolbarTrigger -> toolbarTrigger

1. add menu items for `clear logs`, `change fonts`, `wrap text` and `top most` functions.
2. hide toolbar default. but you can trigger it out by menu.

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