Common/CommonFuncs: Remove now-unneccessary ArraySize function

Since C++17, non-member std::size() is present in the standard library
which also operates on regular C arrays. Given that, we can just replace
usages of ArraySize with that where applicable.

In many cases, we can just change the actual C array ArraySize() was
called on into a std::array and just use its .size() member function
instead.

In some other cases, we can collapse the loops they were used in, into a
ranged-for loop, eliminating the need for en explicit bounds query.

Source/Core/VideoBackends/D3D12/PerfQuery.cpp

@@ -93,7 +93,7 @@ void PerfQuery::ResetQuery()
   m_query_resolve_pos = 0;
   m_query_readback_pos = 0;
   m_query_next_pos = 0;
-  std::fill_n(m_results, ArraySize(m_results), 0);
+  std::fill(std::begin(m_results), std::end(m_results), 0);
   for (auto& entry : m_query_buffer)
   {
     entry.fence_value = 0;