JDK8, lint fixing (#2888)

* Use Kotlin JDK8

* Satisfy a ton of lints

* Run res/layout files (and manifest) through reformatter

app/src/main/java/eu/kanade/tachiyomi/data/glide/FileFetcher.kt

@@ -5,6 +5,7 @@ import android.util.Log
 import com.bumptech.glide.Priority
 import com.bumptech.glide.load.DataSource
 import com.bumptech.glide.load.data.DataFetcher
+import timber.log.Timber
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileNotFoundException
@@ -24,7 +25,7 @@ open class FileFetcher(private val file: File) : DataFetcher<InputStream> {
             data = FileInputStream(file)
         } catch (e: FileNotFoundException) {
             if (Log.isLoggable(TAG, Log.DEBUG)) {
-                Log.d(TAG, "Failed to open file", e)
+                Timber.d(e, "Failed to open file")
             }
             callback.onLoadFailed(e)
             return