…rocessed for unchanged lines (Fixes java-diff-utils#219)
- Introduces a new protected method `processEqualities(String)` in DiffRowGenerator
- Builder exposes `.processEqualities(Function<String,String>)`
- Equal (unchanged) lines now invoke processEqualities()
- Inline diffs remain unchanged (as expected in Option 3)
- Added new test suite DiffRowGeneratorEqualitiesTest
- Updated documentation and Javadoc for new extension point
- Fixes java-diff-utils#219 (HTML escaping issue when inline diff by word)