Master

Pulling in the latest changes, mainly:

• Fix which library MQTT client comes from so f-droid users get the latest networking functionality
• Add a new regex-based filtering system to the wordlist browser

This was just released on the Google Play store and on github/sourceforge, so there's no user data to confirm it works, but I've tested these builds and the f-droid build thoroughly and all seem fine. The regex changes are extensive, but actually localized and any problems introduced will impact few users.