add_by_email() --> Strip "Fwd: " from subject lines

[sharedphysics]

• Removed "Fwd: " from subject lines. This means adding articles as fwded emails will look cleaner.
• Optional next steps: --- Modify re function to account for all different types of "FWD/fwd/Fwd" --- Modify re function to account for "Re:" (and variations) --- Process data above the email metadata as a custom note. (I.e., if someone fwds/replies to add to Lurnby, keep the reply/fwd text above the metadata as a note, external to the article.