Support constants that reference to compile time literals

[cuzfrog]

1. local reference:

class Constants {
    static final String C1 = "abc";
    static final String SHOULD_BE_SUPPORTED = C1;
}

class Constants {
    static final String C1 = "abc";
    static final String SHOULD_BE_SUPPORTED = Constants.C1;
}

2. imported reference:

import a.b.C;

class Constants {
    static final String SHOULD_BE_SUPPORTED = C.C1;
}

3. staticly imported reference:

import static a.b.C.C1;

class Constants {
    static final String SHOULD_BE_SUPPORTED = C1;
}

4. package level reference:

class Constants {
    static final String SHOULD_BE_SUPPORTED = C.C1;
}

5. nested references.
6. inherited reference.
7. static block