Supporting Android 12 Bluetooth permissions. pauldemarco#940

Delay Bluetooth permission & turn-on-Bluetooth system popups on iOS p…

…auldemarco#964

Add bonded devices to Android pauldemarco#586

prepare for release 0.10.0

Migrate plugin to null safety.

Update CHANGELOG for version 0.7.3.

Bump version to 0.7.2

* Add `allowDuplicates` option to `startScan`.
* Fix performance issue with GUID initializers.

Bump version to 0.7.1+1

Bump version to 0.7.1

Bump version to 0.7.0