refactor out privacy analysis

[RCasatta]

lib/src/offline/print.rs:        result.info.push("Privacy: outputs have different script types https://en.bitcoin.it/wiki/Privacy#Sending_to_a_different_script_type".to_string());
lib/src/offline/print.rs:            result.info.push("Privacy: outputs have different precision https://en.bitcoin.it/wiki/Privacy#Round_numbers".to_string());
lib/src/offline/print.rs:                result.info.push("Privacy: smallest output is smaller then smallest input https://en.bitcoin.it/wiki/Privacy#Unnecessary_input_heuristic".to_string());
lib/src/offline/print.rs:            "Privacy: address reuse https://en.bitcoin.it/wiki/Privacy#Address_reuse".to_string(),
lib/src/offline/print.rs:        assert_eq!("Privacy: outputs have different script types https://en.bitcoin.it/wiki/Privacy#Sending_to_a_different_script_type", result.info[0]);
lib/src/offline/print.rs:        assert_eq!("Privacy: outputs have different precision https://en.bitcoin.it/wiki/Privacy#Round_numbers", result.info[1]);