Updates

• fix selection background not there after picking a drawerItem
    - allow selectExtension to properly maintain the single selection handling
    - FIX #2614
• upgrade AndroidX dependencies
• update to FastAdapter 5.1.0
• update to Iconics 5.0.3
• update to AboutLibs 8.1.6

Migration

• Due to core-ktx 1.3 jvm target is now required to be 1.8

kotlinOptions {
        jvmTarget = "1.8"
}