v0.2.1

Fixed

• Pasting with Ctrl+V after copying inside bunker froze the window. bunk's
  copy and paste keys now use the window's own clipboard, like
  Ctrl+Shift+C and Ctrl+Shift+V, and never wait on a clipboard command.
• A split into the same container (Alt+F1) no longer freezes the window
  while podman or docker answers.
• If the window ever stops responding for 5 seconds, bunker logs where it is
  stuck, so the cause can be found.