Kernel: New handle manager

This handle manager more closely mirrors the behaviour of the CTR-OS
one. In addition object ref-counts and support for DuplicateHandle have
been added.

Note that support for DuplicateHandle is still experimental, since parts
of the kernel still use Handles internally, which will likely cause
troubles if two different handles to the same object are used to e.g.
wait on a synchronization primitive.

src/core/hle/kernel/mutex.cpp

@@ -87,7 +87,7 @@ void ReleaseThreadMutexes(Handle thread) {
     
     // Release every mutex that the thread holds, and resume execution on the waiting threads
     for (MutexMap::iterator iter = locked.first; iter != locked.second; ++iter) {
-        Mutex* mutex = g_handle_table.GetFast<Mutex>(iter->second);
+        Mutex* mutex = g_handle_table.Get<Mutex>(iter->second);
         ResumeWaitingThread(mutex);
     }
 
@@ -136,7 +136,8 @@ ResultCode ReleaseMutex(Handle handle) {
  */
 Mutex* CreateMutex(Handle& handle, bool initial_locked, const std::string& name) {
     Mutex* mutex = new Mutex;
-    handle = Kernel::g_handle_table.Create(mutex);
+    // TODO(yuriks): Fix error reporting
+    handle = Kernel::g_handle_table.Create(mutex).ValueOr(INVALID_HANDLE);
 
     mutex->locked = mutex->initial_locked = initial_locked;
     mutex->name = name;