#KT-1426 Implement "Optimize Imports" in plugin - fixes for used reference search (look to calls and work with java type constructors.)

idea/testData/editor/optimizeImports/UnusedImports.kt

@@ -4,10 +4,11 @@ import java.lang.StringBuilder
 import java.net.HttpRetryException
 import java.util.ArrayList
 import kotlin.util.measureTimeMillis
+import java.util.HashMap
 
 class Action {
     fun test() {
-        measureTimeMillis({ println("Some")})
+        measureTimeMillis({ println(HashMap<String, Int>().size()) })
         val test : ArrayList<Int>? = null
     }
 }

idea/testData/editor/optimizeImports/UnusedImports_after.kt

@@ -1,9 +1,10 @@
 import java.util.ArrayList
+import java.util.HashMap
 import kotlin.util.measureTimeMillis
 
 class Action {
     fun test() {
-        measureTimeMillis({ println("Some")})
+        measureTimeMillis({ println(HashMap<String, Int>().size()) })
         val test : ArrayList<Int>? = null
     }
 }