feat: wi-fi - join WPA2/WPA3-PSK networks and carry traffic like ethernet

tests/wifi/shim/CppLib/Spinlock.hpp

@@ -0,0 +1,19 @@
+#pragma once
+#include <atomic>
+#include <cstdint>
+namespace kcp {
+    class Spinlock {
+        std::atomic_flag f{ATOMIC_FLAG_INIT};
+    public:
+        void Acquire() { while (f.test_and_set(std::memory_order_acquire)) {} }
+        void Release() { f.clear(std::memory_order_release); }
+    };
+    // The kernel's Mutex is the non-interrupt-disabling variant; on the host
+    // there is nothing to disable, so the two are the same here.
+    class Mutex {
+        std::atomic_flag f{ATOMIC_FLAG_INIT};
+    public:
+        void Acquire() { while (f.test_and_set(std::memory_order_acquire)) {} }
+        void Release() { f.clear(std::memory_order_release); }
+    };
+}

tests/wifi/shim/CppLib/Stream.hpp

@@ -0,0 +1,2 @@
+#pragma once
+namespace base { struct Manip {}; inline Manip hex, dec; }