Implemented more efficient OTA disabler method, bundled SCP, SFTP and OpenSSL binaries, and Xcode 9 compatibility.

[ohmza]

Replaced qwertyoruiop OTA disabler method to the traditional one which was widely used by many previous well-known jailbreak tools such as Absinthe, Corona Injector, Evasi0n, p0sixspwn, Pangu and Taig.

Bundled SCP, SFTP and OpenSSL binaries in order to make dropbearSSH work with WinSCP and Cyberduck.

Replace all system() functions with posix_spawn functions in order to make it compatibles with Xcode 9 and using Cydia AutoInstall's API to install openssl due to the limitation of posix_spawn() function.