Add support for Open Document Format 1.1

Contains a kernel for the ODF 1.1 encryption implemented in OpenOffice.
The algorithm uses a SHA-1 checksum, a PBKDF2-HMAC-SHA1 key derivation
with 1024 iterations and Blowfish-CFB encryption.

Valid hashes can be extracted with the libreoffice2john.py script,
available from the John the Ripper Jumbo repository at
https://github.com/magnumripper/JohnTheRipper/blob/bleeding-jumbo/run/libreoffice2john.py

You have to remove the filename suffix at the end of the hash before
passing it to hashcat. Also see 'hashcat -m18600 --example-hashes'.

You can leave the filename prefix if you use the --username option to
process those hashes.

 - Add hash-mode 18600 (Open Document Format (ODF) 1.1 (SHA-1, Blowfish))
 - Tests: add hash-mode 18600 (Open Document Format (ODF) 1.1 (SHA-1, Blowfish))

docs/readme.txt

@@ -245,6 +245,7 @@ NVIDIA GPUs require "NVIDIA Driver" (367.x or later)
 - PDF 1.7 Level 3 (Acrobat 9)
 - PDF 1.7 Level 8 (Acrobat 10 - 11)
 - Apple Secure Notes
+- Open Document Format (ODF) 1.1 (SHA-1, Blowfish)
 - Open Document Format (ODF) 1.2 (SHA-256, AES)
 - Password Safe v2
 - Password Safe v3