- render the whole line where the error/warning points to, if any, and another
line with '^', like other compilers do
- lowercase diagnostic severity
- decapitalize the message if it doesn't start with a proper name
This is the case when you reference a Java class in Kotlin whose superclass is
not resolved. Previously this fact was swallowed by LazyJavaClassDescriptor
leading to mysterious compilation errors
#KT-5129 Fixed