Better main function recognition and tests

fix vararg main

compiler/frontend/src/org/jetbrains/kotlin/idea/MainFunctionDetector.java

@@ -84,7 +84,7 @@ public class MainFunctionDetector {
         if (!KotlinBuiltIns.isString(typeArgument)) {
             return false;
         }
-        if (typeArguments.get(0).getProjectionKind() != Variance.INVARIANT) {
+        if (typeArguments.get(0).getProjectionKind() == Variance.IN_VARIANCE) {
             return false;
         }
 

idea/testData/run/MainInTest/module/src/mainInPackageVarianceOut.kt

@@ -1,5 +1,5 @@
 package pkg5
 
 fun main(args: Array<out String>) {
-    // no
+    // yes
 }

idea/testData/run/MainInTest/module/src/varargMain.kt

@@ -0,0 +1,5 @@
+package varargMain
+
+fun main(vararg args: String) {
+    // yes
+}