Migrate to AndroidX (#2424)

* Migrate to AndroidX (automatic conversion by Android Studio)

* AndroidX dependency code updates

* Fix source preference reparenting

* fixes the androidx prefererences icon spacing issue

(cherry picked from commit b76a15d960ec2cdf771be16377db0348b66b3179)

* Fix source preference screen heading size/list padding

Co-authored-by: Carlos <cargo8005@gmail.com>

app/src/main/java/eu/kanade/tachiyomi/data/updater/UpdaterJob.kt

@@ -2,7 +2,7 @@ package eu.kanade.tachiyomi.data.updater
 
 import android.app.PendingIntent
 import android.content.Intent
-import android.support.v4.app.NotificationCompat
+import androidx.core.app.NotificationCompat
 import com.evernote.android.job.Job
 import com.evernote.android.job.JobManager
 import com.evernote.android.job.JobRequest

app/src/main/java/eu/kanade/tachiyomi/data/updater/UpdaterNotifier.kt

@@ -2,7 +2,7 @@ package eu.kanade.tachiyomi.data.updater
 
 import android.content.Context
 import android.net.Uri
-import android.support.v4.app.NotificationCompat
+import androidx.core.app.NotificationCompat
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.notification.NotificationHandler
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
@@ -106,4 +106,4 @@ internal class UpdaterNotifier(private val context: Context) {
         }
         notification.show(Notifications.ID_UPDATER)
     }
-}
+}

app/src/main/java/eu/kanade/tachiyomi/data/updater/UpdaterService.kt

@@ -71,7 +71,7 @@ class UpdaterService : IntentService(UpdaterService::class.java.name) {
             val apkFile = File(externalCacheDir, "update.apk")
 
             if (response.isSuccessful) {
-                response.body()!!.source().saveTo(apkFile)
+                response.body!!.source().saveTo(apkFile)
             } else {
                 response.close()
                 throw Exception("Unsuccessful response")