Exposed visibility checking, a set of exposed visibility tests, some test fixes

Effective visibility mechanism introduced.
Local is considered as public, java protected as Kotlin protected, java package private as Kotlin private.

compiler/testData/diagnostics/tests/override/parameterNames/kotlinInheritsJava.kt

@@ -1,6 +1,6 @@
 // FILE: JavaInterface.java
 
-interface JavaInterface {
+public interface JavaInterface {
     void foo(int javaName);
 }