microG Settings integration, icon/activity changes#1191

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Nanolx wants to merge 7 commits intomicrog:masterfrom

Nanolx:nanolx_uq_settings

Commits on Sep 23, 2020

Separate launcher icon from main activity, so it can be disabled without breaking microG functionality.
Nanolx
committed
Fix icon being not displayed on some devices with android 6, 7 and 7.1 (SDK 23,24,25)
Nanolx
committed
improve icon for SDK up to 27 (via @Vavun), new vector icon for SDK 28+ (via @ghost)
Nanolx
committed
clean-up activity aliases for System Settings integration
Nanolx
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Don't show two launcher icons, improve System Settings integration on SDK 28+
Nanolx
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drop duplicated icon
Nanolx
committed
fix for Android Q / android.permissions.ACCESS_BACKGROUND_LOCATION selfcheck
Nanolx
committed