Inheriting public/static modifier in interface member types

## Problem statement
```java
interface Foo {
enum Bar {}
}
```
For this Java code `bar.isPublic()`/`bar.isStatic()` returns `false`, as the `Bar` enum does not specify the `public` (or `static`) modifier. However, §9.5 of the JLS specifies (Emphasis mine):
> Every member class or interface declaration in the body of an interface declaration is **implicitly public and static** ( §9.1.1.3). It is permitted to **redundantly** specify either or both of these modifiers

## Tangential problem
Additionally, §8.9 also states
> **A nested enum class is implicitly static.** That is, every member enum class and local enum class is static. It is permitted for the declaration of a member enum class to redundantly specify he static modifier, but it is not permitted for the declaration of a local enum class (§14.3)

So `bar.isStatic()` ought to return true for this reason as well.

## Question
I would expect `isPublic()` to return true there, as the Enum *does* possess the modifier - even if it is not spelled out explicitly. Many tools (like IntelliJ) will automatically remove / warn when specifying `public` for interface members and I wouldn't expect such a change to have semantic impact on Spoon's model.

So, should those types inherit the `public` and `static` modifiers? I do believe that is the expected behavior, but maybe you have a different opinion.

## Impact
My Javadoc Indexer tool throws away quite a few JDK classes (found as `Map.Entry` was missing) as it considers them private. I don't really think it should be my responsibility to walk up the parent chain for every nested type and manually apply the JLS rules for default modifiers.