Add new shared pointer and make use of it

arm9/source/core/WeakPtr.cpp

@@ -0,0 +1,35 @@
+#include "common.h"
+#include <libtwl/rtos/rtosIrq.h>
+#include "WeakPtr.h"
+
+void WeakPtrBase::ResetIntern()
+{
+    u32 irq = rtos_disableIrqs();
+    auto refCount = _refCount;
+    if (--refCount->weakRefCount == 0)
+    {
+        _refCount = nullptr;
+        rtos_restoreIrqs(irq);
+        delete refCount;
+    }
+    else
+    {
+        rtos_restoreIrqs(irq);
+    }
+}
+
+bool WeakPtrBase::LockIntern() const
+{
+    u32 irq = rtos_disableIrqs();
+    if (_refCount->refCount != 0)
+    {
+        _refCount->refCount++;
+        rtos_restoreIrqs(irq);
+        return true;
+    }
+    else
+    {
+        rtos_restoreIrqs(irq);
+        return false;
+    }
+}