* Implement the line chart on Log View window for inbound/outbound traffic per second

* Implement dynamic tray icon to indicate Inbound and Outbound

* Refine linechart

* Bugfix for dynamic icon

* Refine chart presentation

* Change the data points' type for more accurate calculation

* Tweak inbound/outbound indicator image for tray icon

# Conflicts:
#	README.md
#	shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
#	shadowsocks-csharp/Controller/Service/PACServer.cs
#	shadowsocks-csharp/Controller/Strategy/SimplyChooseByStatisticsStrategy.cs
#	shadowsocks-csharp/Data/cn.txt
#	shadowsocks-csharp/Model/Configuration.cs
#	shadowsocks-csharp/Model/LogViewerConfig.cs
#	shadowsocks-csharp/View/LogForm.Designer.cs
#	shadowsocks-csharp/View/LogForm.cs
#	shadowsocks-csharp/View/MenuViewController.cs

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.

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

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.

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