v4.3.0

Added

• Warning about closing the app while programming, which may lead to unwanted
  consequences.

Changed

• Update nrfutil device to v2.1.1.

Fixed

• Valid Modem Firmware for Thingy:91 was previously detected as incorrect.
• Show the device family in the Memory layout title for MCUboot devices.
• Windows and Linux: Dragging and dropping a file into the file memory layout
  opened the file in an editor.
• File related warnings were not always removed when removing file regions.

Removed

• Enable MCUboot toggle.