Frostwire-android-2.1.8-build-609

FrostWire 2.1.8 build 609

- SoundCloud search/downloads fixed 
 - Ads can be temporarily removed by playing a rewarded video ad
 - androidx.browser:browser:1.2.0-rc01 update
 - androidx.exifinterface:exifinterface:1.1.0 update
 - com.applovin:applovin-sdk:9.10.5 update
 - com.unity3d.ads:unity-ads:3.4.0 new
 - com.android.billingclient:billing:2.1.0 update
 - dev: com.android.tools.build:gradle:3.5.3
 - cleanups and optimizations