Store "Sub-strings to not learn" in an obfuscated manner in the SQLite3 database

[Theclaws]

In the SQL Version (~April 03, 2015 04:16:57 PM) the 'Sub-strings to not learn' settings field is a password field, but the value is eventually stored in the text file Preferences.ini in plaintext.

As this setting's intention is to prevent the recording of users whole passwords, it should be stored in the SQLite datebase in some obfuscated form, instead of the Preferences.ini.

Suggestion would that this should NOT be stored in the 'WordlistLearned.db' file as users may want reload their word list from WordlistLearned.txt on occasion :)