Allow save files to upgrade between Nitrox versions

[RomikB]

Are you on the latest version of Nitrox?

Yes, I'm on the latest commit of the repo (only for experts).

Which OS are you playing on?

Windows

On which platform did you buy Subnautica?

MS-Store/Windows Store (currently not supported, don't file any reports if your are using this)

Describe the issue.

Upgraded server can't load a world from prev version. Is it as expected?

Describe the steps you took to encounter the bug.

Build new server. Run it.

Relevant log output

Console log: https://pastebin.com/tzv502P8

[Measurity]

Unfortunately, yes this is expected. We have to write manual upgrade scripts between versions for this to work. 1.8 isn't officially released yet.

In the future, we'll migrate to a database which can be upgraded more easily than JSON files.