MacOS build

[philipp-eisen]

No description provided.

[philipp-eisen]

To give a bit more context on the changes here:

In the csproj basically:

• fixing some paths (deps -> packages)
• explicit DLL refs (System.Buffers, System.Memory, Unsafe, neststandard)
• and gating windows only vs linux and macos

then the script is just to build on macos.

===

I think to make it really nice for macos there is a few more things missing. Basically what makes it nice IMO is to have an app bundle and distribute it via a signed dmg like on my main branch:

https://github.com/philipp-eisen/DuckGameRebuilt-macos

There is a few other changes there as well such as ensuring we don't write into the app bundle directory since that is not allowed in macos.

I think it makes sense to merge the additional changes later though. Let me know if you have any more questions about this PR.

===

Also I did test a few mods here's the current status:

DWEP: ❌ - crashes the game
Ancient Mysteries: ❌ - crashes the game
UFF: ✅ works
Anime Hats: ✅ works
holy ducks: ✅ works