Custom exception for buffer over/underflow

[msx80]

Implements #872

[theigl]

@msx80: Thanks a lot for the PR!

Please apply mvn formatter:format on the PR, so we can be sure it adheres to the project code style.

Since this is affecting the public API, I'll try to get feedback from the project's original author.

[msx80]

should be ok now

[theigl]

@msx80: Thank you for your patience!

I finally found the time to get some feedback. We only need one minor change to your PR: Please remove the KryoIOException superclass. We don't really need it at the moment and can add it back anytime, should somebody ask for it. Then I'll merge the PR.

[msx80]

i've removed it, let me know if it's ok thank you :)

[theigl]

Merged, thank you @msx80!