KT-6628 Allow imports of classes from root package

#KT-6628 Fixed

idea/testData/decompiler/navigation/usercode/TypeWithSameShortName.kt

@@ -2,7 +2,7 @@ import testData.libraries.*
 
 fun foo() {
     processDouble(1.0);
-    processDouble(Double())
+    processDouble(testData.libraries.Double())
 }
 
 // main.kt

idea/testData/quickfix/conflictingImports/afterRemoveConflictingImport.kt

@@ -0,0 +1,8 @@
+// "Remove conflicting import for 'java.util.ArrayList'" "true"
+package test
+
+import java.util.HashMap as ArrayList
+
+fun foo(a : ArrayList<String, String>) {
+
+}

idea/testData/quickfix/conflictingImports/beforeRemoveConflictingImport.kt

@@ -0,0 +1,9 @@
+// "Remove conflicting import for 'java.util.ArrayList'" "true"
+package test
+
+import java.util.ArrayList<caret>
+import java.util.HashMap as ArrayList
+
+fun foo(a : ArrayList<String, String>) {
+
+}

idea/testData/quickfix/uselessImports/afterRemoveUselessImport.kt

@@ -1,8 +0,0 @@
-// "Remove useless import for 'test'" "true"
-package test
-
-import org.jetbrains
-
-fun main(args : Array<String>) {
-
-}

idea/testData/quickfix/uselessImports/beforeRemoveUselessImport.kt

@@ -1,9 +0,0 @@
-// "Remove useless import for 'test'" "true"
-package test
-
-import org.jetbrains
-import test<caret>
-
-fun main(args : Array<String>) {
-
-}

idea/testData/resolve/references/FakeJavaLang3.kt

@@ -1,8 +1,8 @@
 package nonRoot
-import java.lang.* // will not import Fake
+import java.lang.*
 
 fun foo() {
     <caret>Fake()
 }
 
-//REF_EMPTY
+//REF: (java.lang).Fake

idea/testData/resolve/references/ImportFromRootScope.kt

@@ -2,4 +2,4 @@ package test
 
 import <caret>Klass
 
-//REF_EMPTY
+//REF: (<root>).Klass