Add chilkat libraries

[fingolfin]

Library available for many platforms and with higher level interfaces for many langes. See https://www.chilkatsoft.com/ssh-features.asp

Release notes: http://cknotes.com/category/release-notes/

Some strings from ruby bundle:

wodFTPD 2.1.4
FlowSsh

SSH-2.0-ChilkatSSH_2.1.0
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1,diffie-hellman-group14-sha1,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521
ssh-rsa,ssh-dss
ssh-dss,ssh-rsa
aes128-cbc,twofish128-cbc,blowfish-cbc,3des-cbc,arcfour128,arcfour256
aes256-ctr,aes128-ctr,aes256-cbc,aes128-cbc,twofish256-cbc,twofish128-cbc,blowfish-cbc,3des-cbc,arcfour128,arcfour256
aes256-cbc,aes128-cbc,twofish256-cbc,twofish128-cbc,blowfish-cbc,3des-cbc,arcfour128,arcfour256
hmac-sha2-256,hmac-sha1,hmac-sha2-512,hmac-md5,hmac-ripemd160,none
zlib,zlib@openssh.com,none

aes256-ctr
ServerDoesNotSupport
aes128-ctr
aes128-cbc
twofish256-cbc
twofish128-cbc
blowfish-cbc
3des-cbc
arcfour128
arcfour256
hmac-sha2-256
hmac-sha1
hmac-sha2-512
hmac-md5
hmac-ripemd160
zlib@openssh.com
diffie-hellman-group-exchange-sha256
diffie-hellman-group-exchange-sha1
diffie-hellman-group1-sha1
diffie-hellman-group14-sha1
curve25519-sha256@libssh.org
ecdh-sha2-nistp256
ecdh-sha2-nistp384
ecdh-sha2-nistp521