Use UniFile for local source file handling

(cherry picked from commit ca5498434409d4085c404f4ff5ed5e608f430a3b)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/RarPageLoader.kt
#	app/src/main/java/eu/kanade/tachiyomi/ui/reader/loader/ZipPageLoader.kt
#	core/src/main/java/tachiyomi/core/util/system/ImageUtil.kt
#	source-local/src/androidMain/kotlin/tachiyomi/source/local/LocalSource.kt
#	source-local/src/androidMain/kotlin/tachiyomi/source/local/image/LocalCoverManager.kt
#	source-local/src/commonMain/kotlin/tachiyomi/source/local/image/LocalCoverManager.kt

core/src/main/java/eu/kanade/tachiyomi/util/storage/EpubFile.kt

@@ -1,7 +1,9 @@
 package eu.kanade.tachiyomi.util.storage
 
+import com.hippo.unifile.UniFile
 import org.jsoup.Jsoup
 import org.jsoup.nodes.Document
+import tachiyomi.core.storage.toFile
 import java.io.Closeable
 import java.io.File
 import java.io.InputStream
@@ -11,12 +13,12 @@ import java.util.zip.ZipFile
 /**
  * Wrapper over ZipFile to load files in epub format.
  */
-class EpubFile(file: File) : Closeable {
+class EpubFile(file: UniFile) : Closeable {
 
     /**
      * Zip file of this epub.
      */
-    private val zip = ZipFile(file)
+    private val zip = ZipFile(file.toFile())
 
     /**
      * Path separator used by this epub.

core/src/main/java/tachiyomi/core/storage/AndroidStorageFolderProvider.kt

@@ -1,4 +1,4 @@
-package tachiyomi.core.provider
+package tachiyomi.core.storage
 
 import android.content.Context
 import android.os.Environment

core/src/main/java/tachiyomi/core/storage/FolderProvider.kt

@@ -1,4 +1,4 @@
-package tachiyomi.core.provider
+package tachiyomi.core.storage
 
 import java.io.File
 

core/src/main/java/tachiyomi/core/storage/UniFileExtensions.kt

@@ -1,9 +1,12 @@
 package tachiyomi.core.storage
 
 import com.hippo.unifile.UniFile
+import java.io.File
 
 val UniFile.extension: String?
     get() = name?.substringAfterLast('.')
 
 val UniFile.nameWithoutExtension: String?
     get() = name?.substringBeforeLast('.')
+
+fun UniFile.toFile(): File? = filePath?.let { File(it) }

core/src/main/java/tachiyomi/core/util/system/ImageUtil.kt

@@ -43,7 +43,8 @@ import kotlin.math.min
 
 object ImageUtil {
 
-    fun isImage(name: String, openStream: (() -> InputStream)? = null): Boolean {
+    fun isImage(name: String?, openStream: (() -> InputStream)? = null): Boolean {
+        if (name == null) return false
         // SY -->
         if (File(name).extension.equals("cbi", ignoreCase = true)) return true
         // SY <--