Release 0.4.1

This release adds persistent task execution and SSH host-key fingerprint
display, and updates herethere.

• Added tasks_here.TaskRunner for persistent sequential task execution,
  with retries, pause/resume, progress inspection, and recovery after app restart
• Added TaskRunner.export_results() to save task results as a JSON file
  for download from the device
• Added the SSH host-key SHA-256 fingerprint to the connection screen
• Updated herethere to 0.3.3, adding optional SSH host-key verification
  and %there put / Client.put() for transferring local Python values
  into the remote live namespace