Improving group mode#33

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dcnoaoh wants to merge 10 commits intokhuttun:masterfrom

nholtware:master

Commits on Jan 8, 2019

Commits on Jan 9, 2019

Commits on Jan 13, 2019

Seperated code paths for Android Nougat and Pre-Nougat
nholtware
committed

Commits on Jan 25, 2019

Commits on Jan 26, 2019

Reverted changes to notificationManager type
nholtware
committed

Commits on Jan 27, 2019

nholtware
committed