fixed password mask

Use new string in https://github.com/shadowsocks/shadowsocks-windows/pull/592

- use mbedtls_md5() instead
- update libsscrypto

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

Replaced SocketFlags.None (an enum which euqals 0) from zero.

Support one-time authentication in ss urls for sharing

This commit implements the new ss protocol proposed here:
https://github.com/shadowsocks/shadowsocks-org/issues/16

Also removes a TODO in Server.cs. You are welcome.

Feature #490 We can get proxy state according to tray icon color

Minor fixes

not check update when no configuration

Conditional compile

bump 3.0

update privoxy to 3.0.24

feature/statistics ui

Correct AvailabilityStatistics's behavior under special strategies like "LoadBalance", which may switch the server several times in a short period.

The executable was modified based on official release version, which
prevents privoxy from showing tray icon.
jmp dword ptr [<&SHELL32.Shell_NotifyIconA>]  => nop

This should close #455

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

# Conflicts:
#	shadowsocks-csharp/Controller/Service/AvailabilityStatistics.cs
#	shadowsocks-csharp/Controller/Strategy/StatisticsStrategy.cs
#	shadowsocks-csharp/View/StatisticsStrategyConfigurationForm.cs

Using StringEx