release-v1.6.3

What's Changed

• Code analysis cleanup by @koculu in #30
• Mark new disk segment null after the event is invoked. by @koculu in #31
• Add descending comparers for primitive types by @KSemenenko in #32
• Refactor disk segments by @koculu in #33
• Remove redundant unsafe flags. by @koculu in #34
• Reduce code duplication by @koculu in #35
• Fix BTree deadlock on split. by @koculu in #36

Full Changelog: release-v1.6.2...release-v1.6.3