Support binlog format version 15

What's Changed

• Improve zoom in trace view. by @yuehuang010 in #636
• Verify Global start and end times. by @yuehuang010 in #638
• Show correct number of search results by @davidwengier in #640
• Add support for version 15 by @edvilme in #644

New Contributors

• @edvilme made their first contribution in #644

Full Changelog: v2.1.746...v2.1.758