Get rid of split packages in descriptors, descriptors.jvm, deserialization

Also move some other files to related packages and reformat moved files

idea/idea-core/src/org/jetbrains/kotlin/idea/core/ImportableFqNameClassifier.kt

@@ -16,11 +16,10 @@
 
 package org.jetbrains.kotlin.idea.core
 
-import org.jetbrains.kotlin.builtins.DefaultBuiltIns
+import org.jetbrains.kotlin.builtins.jvm.JavaToKotlinClassMap
 import org.jetbrains.kotlin.idea.util.ImportInsertHelper
 import org.jetbrains.kotlin.load.java.components.JavaAnnotationMapper
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.platform.JavaToKotlinClassMap
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.resolve.ImportPath
 import java.util.*