Fix the exports

[noah1510]

At the moment the game exports are broken. This seems to affect all types of produced binaries. The following causes need to be evaluated and improved:

• export add-ons only for client
• exclude client only scenes on the server
• fix the somehow broken client

All of this will need testing on windows, Linux and macos once done. Linux needs to work both as amd64 and aarch64 build.

[noah1510]

This is part of the 4.3 branch.
The 0.1.1 tag seems to work (or mostly not) as the editor variants.
It still includes the addons and many client only parts.