Add inspection "main should return Unit" #KT-16085 Fixed

idea/testData/inspectionsLocal/mainFunctionReturnUnit/.inspection

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+org.jetbrains.kotlin.idea.inspections.MainFunctionReturnUnitInspection

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notMain.kt

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+// PROBLEM: none
+<caret>fun test(args: Array<String>): Int = 1

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit1.kt

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+// FIX: Add explicit Unit return type
+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>) = 1

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit1.kt.after

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+// FIX: Add explicit Unit return type
+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>): Unit = 1

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit2.kt

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+// FIX: Change return type to Unit
+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>): Int = 1

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit2.kt.after

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+// FIX: Change return type to Unit
+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>): Unit = 1

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit3.kt

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+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>): Int {
+    return 1
+}

idea/testData/inspectionsLocal/mainFunctionReturnUnit/notUnit3.kt.after

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+// DISABLE-ERRORS
+<caret>fun main(args: Array<String>): Unit {
+    return 1
+}

idea/testData/inspectionsLocal/mainFunctionReturnUnit/unit.kt

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+// PROBLEM: none
+<caret>fun main(args: Array<String>) {}