Highlight unused parameters in main function in 1.3 (KT-26999)

idea/testData/checker/regression/BadParseForClass.kt

@@ -1,4 +1,4 @@
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
     String.class<EOLError descr="Name expected"></EOLError>
 }
 

idea/testData/checker/regression/DoubleDefine.kt

@@ -38,7 +38,7 @@ fun evaluate(expr: StringBuilder, numbers: ArrayList<Int>): Int {
   return lhs
 }
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
   System.out.println("24 game")
   val numbers = ArrayList<Int>(4)
   val rnd = Random();

idea/testData/checker/regression/Jet69.kt

@@ -4,7 +4,7 @@ fun parse(<warning>cmd</warning>: String): Command? { return null  }
 
 fun Any.<warning>equals</warning>(other : Any?) : Boolean = this === other
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
     val command = parse("")
     if (command == null) <warning>1</warning> // error on this line, but must be OK
 }

idea/testData/checker/regression/SpecififcityByReceiver.kt

@@ -1,6 +1,6 @@
 fun Any.<warning>equals</warning>(<warning>other</warning> : Any?) : Boolean = true
 
-fun main(args: Array<String>) {
+fun main(<warning>args</warning>: Array<String>) {
 
     val command : Any = 1