moving some ListItem functions into Commons

Author: tibbi

app/src/main/kotlin/com/simplemobiletools/filemanager/pro/models/ListItem.kt

@@ -1,20 +1,6 @@
 package com.simplemobiletools.filemanager.pro.models
 
-import com.bumptech.glide.signature.ObjectKey
 import com.simplemobiletools.commons.models.FileDirItem
-import java.io.File
 
 data class ListItem(val mPath: String, val mName: String = "", var mIsDirectory: Boolean = false, var mChildren: Int = 0, var mSize: Long = 0L, var mModified: Long = 0L,
-                    var isSectionTitle: Boolean) : FileDirItem(mPath, mName, mIsDirectory, mChildren, mSize, mModified) {
-    fun getSignature(): String {
-        val lastModified = if (modified > 1) {
-            modified
-        } else {
-            File(path).lastModified()
-        }
-
-        return "$path-$lastModified-$size"
-    }
-
-    fun getKey() = ObjectKey(getSignature())
-}
+                    var isSectionTitle: Boolean) : FileDirItem(mPath, mName, mIsDirectory, mChildren, mSize, mModified)