Add new shared pointer and make use of it

arm9/source/core/SharedPtr.cpp

@@ -0,0 +1,31 @@
+#include "common.h"
+#include <libtwl/rtos/rtosIrq.h>
+#include "SharedPtr.h"
+
+void SharedPtrBase::ResetIntern()
+{
+    auto refCount = _refCount;
+    _object = nullptr;
+    _refCount = nullptr;
+    u32 irq = rtos_disableIrqs(); // 1
+    if (--refCount->refCount == 0) [[gnu::unlikely]]
+    {
+        refCount->weakRefCount++; // ensure the ref count is not destructed elsewhere
+        rtos_restoreIrqs(irq); // 1
+        refCount->DestructObject();
+        irq = rtos_disableIrqs(); // 2
+        if (--refCount->weakRefCount == 0) [[gnu::unlikely]]
+        {
+            rtos_restoreIrqs(irq); // 2
+            delete refCount;
+        }
+        else
+        {
+            rtos_restoreIrqs(irq); // 2
+        }
+    }
+    else
+    {
+        rtos_restoreIrqs(irq); // 1
+    }
+}