Refactor BackgroundLocationTrackerPlugin#94

JeroenKoster wants to merge 2 commits intoicapps:mastericapps/flutter-background-location-tracker:masterfrom

JeroenKoster:jk-improve-engine-cache-and-lockingJeroenKoster/flutter-background-location-tracker:jk-improve-engine-cache-and-lockingCopy head branch name to clipboard