Use ref readonly instead of in

[Perksey]

Manually defines the RequiresLocationAttribute given that we can't upgrade away from the .NET 7 SDK and thereby get C# 12.

[Perksey]

Ready for review.

[Perksey]

Confirmed working by testing against vk.CreateInstance

unsafe
{
    var vk = Vk.GetApi();
    vk.CreateInstance(new InstanceCreateInfo(), null, null);
}

0>------- Started building project: Scratch
0>Program.cs(8,23): Warning CS9193 : Argument 1 should be a variable because it is passed to a 'ref readonly' parameter
Scratch -> /Users/dylan/Documents/RiderProjects/Scratch/Scratch/bin/Debug/net8.0/Scratch.dll
0>------- Finished building project: Scratch. Succeeded: True. Errors: 0. Warnings: 1

[Perksey]

@Beyley Ready for review. I'm intending to update the non-Clang bindings at some point, did you want me to do that here or in a separate PR?

[Beyley]

i think im too stupid to understand the reason for this, but the code itself looks good
after this is merged in i'll do a full update/regen of all the bindings including clang stuff

i'd do an approval but the github UI crashes trying to open the review interface

[Perksey]

Force merging per Beyley's comment