Solve kotlin warnings

[ironjan]

w: /home/ljan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.2.41/9e7a6f582de73d9cdc6c56ef4e23604a0ee55768/kotlin-stdlib-jre7-1.2.41.jar: kotlin-stdlib-jre7 is deprecated. Please use kotlin-stdlib-jdk7 instead
w: /home/ljan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.2.41/9e7a6f582de73d9cdc6c56ef4e23604a0ee55768/kotlin-stdlib-jre7-1.2.41.jar: kotlin-stdlib-jre7 is deprecated. Please use kotlin-stdlib-jdk7 instead
w: /home/ljan/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.2.41/9e7a6f582de73d9cdc6c56ef4e23604a0ee55768/kotlin-stdlib-jre7-1.2.41.jar: kotlin-stdlib-jre7 is deprecated. Please use kotlin-stdlib-jdk7 instead
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (81, 17): 'getLayoutInflater(Bundle?): LayoutInflater' is deprecated. Deprecated in Java
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (85, 48): Parameter 'dialog' is never used, could be renamed to _
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (85, 56): Parameter 'action' is never used, could be renamed to _
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (94, 51): 'isAlreadyIn(HistoricTrack): Int' is deprecated. Move to {@link SongSaver#contains(HistoricTrack)}
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (180, 60): Parameter 'dialog' is never used, could be renamed to _
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (190, 53): Parameter 'dialog' is never used, could be renamed to _
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/FavoritesFragment.kt: (190, 61): Parameter 'action' is never used, could be renamed to _
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/SongSaver.kt: (125, 17): 'isAlreadyIn(HistoricTrack): Int' is deprecated. Move to {@link SongSaver#contains(HistoricTrack)}
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/favorites/SongSaver.kt: (170, 16): 'isAlreadyIn(HistoricTrack): Int' is deprecated. Move to {@link SongSaver#contains(HistoricTrack)}
w: /home/ljan/projects/metal-only/app/src/main/kotlin/com/codingspezis/android/metalonly/player/utils/ImageLoader.kt: (134, 27): This class shouldn't be used in Kotlin. Use kotlin.Any instead.