Dropping package facades:

- light classes: do not generate light class for package facade
- drop package facades as multifile classes compilation mode support
- get rid of some additional package facade fqName usages
- update tests for light classes

idea/testData/kotlinAndJavaChecker/JvmOverloadsFunctions.java

@@ -1,6 +1,6 @@
 import test.kotlin.A;
 
-import static test.kotlin.KotlinPackage.foo;
+import static test.kotlin.JvmOverloadsFunctionsKt.foo;
 
 class JvmOverloadsFunctions {
     public static void main(String[] args) {