Volume in Notification

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v3.0:
== Android 5.0+ ==
- Added option to display buttons with icons

== Android 8.0 ==
- Added option to set notification importance
- Bug fix for notification height when set on Low importance

== Android 4.1 to 7.X ==
- Added option to set priority on Max

v3.1:
Bug fix for status bar icon on Android 5.0