Replace deprecated NSAlert methods
Tweak README
Update version histories
Fix file drop setting (fix #132)
Fix file drop with multiple extensions of files
Fix descriptions in version histories
Fix a comment line
Fix text wrap setting change on vertical layout orientation (#135)
Rename a property
Tweak popup button label in English
update version number and release date
Merge branch 'release/1.5.3' into develop
Increase version and clean changelog
Replace outline regex with NSRegularExpression
Simplify outline extracting logic
Use ICU library to validate outline menu syntax
Perform outline extracting on background thread (ref #138)
Update changelog
Merge branch 'refs/heads/feature/outlineRegex' into develop
Fix typos in changelog