adding some new sort options

build.gradle

@@ -6,7 +6,7 @@ buildscript {
         propMinSdkVersion = 16
         propTargetSdkVersion = propCompileSdkVersion
         propVersionCode = 1
-        propVersionName = '3.13.11'
+        propVersionName = '3.13.12'
         kotlin_version = '1.2.21'
         support_libs = '27.0.2'
     }

commons/src/main/kotlin/com/simplemobiletools/commons/helpers/Constants.kt

@@ -89,6 +89,9 @@ const val SORT_BY_FIRST_NAME = 128
 const val SORT_BY_MIDDLE_NAME = 256
 const val SORT_BY_SURNAME = 512
 const val SORT_DESCENDING = 1024
+const val SORT_BY_TITLE = 2048
+const val SORT_BY_ARTIST = 5096
+const val SORT_BY_DURATION = 10192
 
 // security
 const val PROTECTION_PATTERN = 0