Bump minimum_zig_version to 0.16.0

[Fahien]

• Replace std.Thread.Mutex with a spinlock over std.atomic.Mutex.
• Reimplement refAllDeclsRecursive.

[hazeycode]

Looks like we need to think about ptr alignment for compatibility on some target platforms. See build errors on windows here https://github.com/zig-gamedev/zphysics/actions/runs/27956950390/job/82778199618#step:5:1

[Fahien]

@hazeycode Looks like we need to think about ptr alignment for compatibility on some target platforms. See build errors on windows here https://github.com/zig-gamedev/zphysics/actions/runs/27956950390/job/82778199618#step:5:1

Maybe related to https://codeberg.org/ziglang/zig/issues/31576 ?

[Fahien]

I guess this Vexu/arocc#1058 might fix the problem, but I am not sure when 😄