v150

Removed

• Overlay tooltip inner padding should be set by the content within it.

Added

• Ability to remove the launcher window again. This is especially needed on
  shutdown. Otherwise when at that time someone still tries to send IPC
  messages to the launcher window, an exception is thrown.

Fixed

• Overlay tooltips weren't centered due to incorrect sizing styles.
• When spawning the nrfutil process fails in certain ways, an uncaught
  exception in the main process got thrown. The “certain ways” make this a bit
  hard to reproduce: On macOS this happened, when the nrfutil executable did
  not have the executable file mode. Usually this should not happen, because
  we set that mode ourselves correctly.