Add wal corruption exception class tests.

Fix null reference exception.

Bug/11 single character string serializer (koculu#13)

* Fix string serializer index out of range issue.

* Improve exception message.

Seal all classes. https://devblogs.microsoft.com/dotnet/performance-i…

…mprovements-in-net-6/#peanut-butter

Mark disk segment volatile.

Adds Steve's challenge test.

Update docs.

Sets default random access device manager.

Fixes deadlock in BTree split..

Improves benchmarks to include disk and memory usage.