Merge pull request #103 from NordicSemiconductor/dependencies

Dependencies updated, again

Merge pull request #101 from keith-lytc/feature/nordic/fs_manager

Added FsManager file download support

Merge pull request #100 from keith-lytc/feature/nordic/android-bump

Updated library to support compilation on newer flutter versions and bumped dependency versions.

Fix #84 and other small improvements

Prevent request Bluetooth permission on iOS until it is required (#81)

Read image list (#66):

- Added method to read image list

Added parameters to SingleImageUpdate

Minor bugfix

Bugfixes on both platforms

New Log System and update with single image