ICU-20150 API status of equals()/hashCode() should match the ICU class's status ...

ICU-20150 API status of equals()/hashCode() should match the ICU class's status (#153)

- Updated API status of java.lang.Object method overrides (equals/hashCode/toString/clone) to match status of declaring class. There are some API comments that is insufficient, or incorrect, or not appropriate after the change. Most of these issues were fixed.

- APIStatusConsistencyChecker and ant tasks invoking the check, designed for checking this requirement. For now, Normalizer#clone() does not satisfy the requirement, but unchanged on purpose. The tool can accept exception.

- DeprecatedAPIChecker had a problem for handling non-static inner class's constructor. CodePointMap$StringIterator is the very first instance of such class in ICU4J. The problem was fixed by removing the implicit param scanned by reflection.

- This commit includes a lot of changes made by Eclipse project configuration - removing spaces in blank lines/end of statement, and removeal of redundant generics type declaration.