Unused import highlighting

#KT-5236 Fixed

idea/testData/inspections/unusedImport/file.kt

@@ -0,0 +1,15 @@
+import java.io.* // unused
+import java.sql.* // used
+
+import java.util.HashMap // unused
+import java.util.ArrayList // used
+
+import java.unresolved.* // unused but unresolved
+import java.net.Unresolved // unused but unresolved
+
+import java.net.ConnectException as CE // highlighting of unused aliases not implemented yet
+
+fun foo(list: ArrayList<String>) {
+    list.add("")
+    Date()
+}

idea/testData/inspections/unusedImport/inspectionData/expected.xml

@@ -0,0 +1,20 @@
+<problems>
+    <problem>
+        <file>file.kt</file>
+        <line>1</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="simple.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused import directive</problem_class>
+        <description>Unused import directive</description>
+    </problem>
+
+    <problem>
+        <file>file.kt</file>
+        <line>4</line>
+        <module>light_idea_test_case</module>
+        <entry_point TYPE="file" FQNAME="simple.kt" />
+        <problem_class severity="WARNING" attribute_key="NOT_USED_ELEMENT_ATTRIBUTES">Unused import directive</problem_class>
+        <description>Unused import directive</description>
+    </problem>
+
+</problems>

idea/testData/inspections/unusedImport/inspectionData/inspections.test

@@ -0,0 +1 @@
+// INSPECTION_CLASS: org.jetbrains.kotlin.idea.inspections.UnusedImportInspection