Update Wiki Documentation for build process

[tvogt]

I'm trying to build from source and the documentation (at https://wiki.facepunch.com/steamworks/#howtobuildfrommasterbranch) seems to be outdated.

What I noticed so far:

• The Steam SDK is included in the source (in the UnityPlugin/redistributable_bin) directory. Not clear if it is still necessary to download and copy the sdk itself, the files seem identical
• The build options in Visual Studio aren't static. When you open the sln File, no "build solution" appears, instead:
• As mentioned elsewhere, the net6 vs. net46 issue breaks the build process at this time if one simply follows the wiki instructions. The language version also seems to be set wrongly:

/usr/local/share/dotnet/sdk/6.0.100-rc.2.21505.57/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.DefaultItems.targets(5,5): Warning NETSDK1182: Targeting .NET 6.0 in Visual Studio 2019 is not supported. (NETSDK1182) (Generator) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Generator/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Generator) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win64) /usr/local/share/dotnet/sdk/6.0.100-rc.2.21505.57/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.DefaultItems.targets(5,5): Warning NETSDK1182: Targeting .NET 6.0 in Visual Studio 2019 is not supported. (NETSDK1182) (Facepunch.Steamworks.Win64) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win64) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win64) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win32) /usr/local/share/dotnet/sdk/6.0.100-rc.2.21505.57/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.DefaultItems.targets(5,5): Warning NETSDK1182: Targeting .NET 6.0 in Visual Studio 2019 is not supported. (NETSDK1182) (Facepunch.Steamworks.Win32) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win32) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Win32) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Posix) /usr/local/share/dotnet/sdk/6.0.100-rc.2.21505.57/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.DefaultItems.targets(5,5): Warning NETSDK1182: Targeting .NET 6.0 in Visual Studio 2019 is not supported. (NETSDK1182) (Facepunch.Steamworks.Posix) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Posix) /Users/tom/Documents/Game Projects/Facepunch/Facepunch.Steamworks/Facepunch.Steamworks/CSC: Error CS1617: Invalid option '10' for /langversion. Use '/langversion:?' to list supported values. (CS1617) (Facepunch.Steamworks.Posix)

[tvogt]

changing the language target to "default" solves the errors and the build works (with warnings). A "rebuild all" seems necessary if one tried a failed build before.

[userKolecko]

Hi, it seems that to target c# 10 you actually need vs 2022. I had the same problem in vs 2019 but 2022 could build without problems. I found the requirements to target c# 10 here.

[jzapdot]

I just put up a PR here (https://github.com/Facepunch/Facepunch.Steamworks/issues/591) that reverts the removal of .Net 4.6 and adds support for being able to build on macOS, this might help you out. We needed .Net 4.6 for Unity still as it can't handle .Net 6 dlls.