Add module.processor for all modules

[dkushche]

For now, not all modules have a defined processor function that could be used for running them without UI. Let's fix it.
Example:
This is good, it's how it should be:

caesar.little_doc = caesar_little_doc
caesar.full_doc = caesar_full_doc
caesar.processor = caesar_processing

This is bad and needs to be fixed:

diffie_hellman.little_doc = diffie_hellman_little_doc
diffie_hellman.full_doc = diffie_hellman_full_doc

Actually, this issue will be fixed after writing the test for all of the modules, but let's fix it now. I already improved modules creator to add processor automatically. So this issue won't happen in the future.