implement proper IRQL, DPCs, kernel and user APCs, alertable waits, async file I/O with cancellation, trap frames, selftests, a real driver/device model, native async FAT32, VFAT dotfile fixes, syscall ABI cleanup, async_apc and async_cancel tests, POSIX multi-volume paths, and pimp the readme.

code/posix/posix_thread.c

@@ -56,7 +56,7 @@ static void PthreadTrampoline(uintptr_t raw) {
     PTHREAD_SLOT* slot = PthreadSlotFind(pid, tid);
     if (!slot) slot = PthreadSlotAlloc(pid, tid);
 
-    SysFree(tr, sizeof(PTHREAD_TRAMP));
+    SysFree(tr);
 
     void* retval = fn(arg);
 
@@ -86,7 +86,7 @@ __declspec(dllexport) int pthread_create(pthread_t* t, const pthread_attr_t* att
     uint32_t s = SysCreateThread((uint64_t)PthreadTrampoline,
                                   (uint64_t)tr, 1 /*PriorityNormal*/, &tid);
     if (s != 0) {
-        SysFree(tr, sizeof(PTHREAD_TRAMP));
+        SysFree(tr);
         return EAGAIN;
     }
     // The trampoline allocates the retval slot itself after it knows its real