* Refine encryption

- Add AES-CTR, blowfish and camellia ciphers

aes-256-ctr
aes-192-ctr
aes-128-ctr
bf-cfb
camellia-128-cfb
camellia-192-cfb
camellia-256-cfb

- Merge the previous PolarSSL and MbedTLS
- Switch to MbedTLS's cipher layer functions
- Add workaround to set cipher operation(encrypt/decrypt)

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

* Add function to get MbedTLS cipher context size

and drop hard-coded ctx sizes

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

- use null conditional access in case some connections been
  cancelled unexpectedly and may cause null reference exception
- Refine error message
- use conditional operator to simplify some code

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

- update libsodium to tagged 1.0.11
- update mbedtls to tagged 2.3.0

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

- display user-friendly server name
- clarify proxy type

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

# Conflicts:
#	shadowsocks-csharp/Controller/Service/TCPRelay.cs
#	shadowsocks-csharp/Controller/ShadowsocksController.cs
#	shadowsocks-csharp/View/MenuViewController.cs

Note:
- Added a configuration entry, user should add this
  by hand or reset from scratch.

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

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

Squashed commit of the following:

commit e280c2385c
Merge: 579039f 87aa9eb
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Wed Mar 16 04:02:27 2016 -0400

    Merge remote-tracking branch 'origin/master'

commit 579039fe40
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 21:45:23 2016 +0800

    log unhandle exception

commit 8d863f1d5f
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 21:44:54 2016 +0800

    fix Availability Statistics

commit b3ce1c698a
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 21:07:54 2016 +0800

    tiny refactor

commit 0f7d39e27e
Merge: bd7078a b01aced
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 20:02:58 2016 +0800

    Merge remote-tracking branch 'origin/master'

commit bd7078aa4f
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 20:01:58 2016 +0800

    tiny refactor

commit 49adb95b6e
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 03:44:26 2016 -0500

    log more Ping information for debug

commit 2aa0620ddd
Author: Gang Zhuo <gang.zhuo@gmail.com>
Date:   Fri Mar 4 03:04:10 2016 -0500

    reduce 3rd packages

[solve conflicts and squash to make history clean]
Signed-off-by: Syrone Wong <wong.syrone@gmail.com>

Simplify MD5 handling

Fix.

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>

update privoxy to 3.0.24

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>

add statistics config translation

ChaCha20 with an extended (96 bit) nonce and a 32-bit counter has
been implemented as crypto_stream_chacha20_ietf() from LibSodium 1.0.4

Please refer to https://tools.ietf.org/html/rfc7539 for details.

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

use __POLIPO_BIND_PORT__ to avoid potential port conflict

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.

follow with 5ae4df94e4

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

Strategy: Simply Choose By Statistics

1. only enable menu items relevant to pac status
2. rename edit pac file into edit local pac file
3. users are allowed to enable online pac then input online pac url, not to input then enable