Show preview when changing user icon

Refresh activate status when ownership transferred to OwnDroid
Set Start user session message and End user session message separately
Set Long support message and Short support message separately
Simplify code

app/src/main/java/com/bintianqi/owndroid/Utils.kt

@@ -34,7 +34,7 @@ fun uriToStream(
     operation: (stream: InputStream)->Unit
 ){
     if(uri!=null){
-        try{
+        try {
             val stream = context.contentResolver.openInputStream(uri)
             if(stream != null) { operation(stream) }
             stream?.close()
@@ -44,26 +44,6 @@ fun uriToStream(
     }
 }
 
-fun List<Any>.toText():String{
-    var output = ""
-    var isFirst = true
-    for(each in listIterator()){
-        if(isFirst) { isFirst = false } else { output+="\n" }
-        output+=each
-    }
-    return output
-}
-
-fun Set<Any>.toText(): String{
-    var output = ""
-    var isFirst = true
-    for(each in iterator()){
-        if(isFirst) { isFirst = false } else { output+="\n" }
-        output += each
-    }
-    return output
-}
-
 fun MutableList<Int>.toggle(status: Boolean, element: Int) {
     if(status) add(element) else remove(element)
 }