Add MakeUnique.h so make_unique is available without C++14

Includes make_unique from C++14 and make_unique_default_init from C++20,
because it doesn't require compiler support

Common/Common.vcxproj

@@ -431,6 +431,7 @@
     <ClInclude Include="KeyMap.h" />
     <ClInclude Include="Log.h" />
     <ClInclude Include="LogManager.h" />
+    <ClInclude Include="MakeUnique.h" />
     <ClInclude Include="MathUtil.h" />
     <ClInclude Include="MemArena.h" />
     <ClInclude Include="MemoryUtil.h" />

Common/MakeUnique.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <memory>
+#include <type_traits>
+
+// Custom make_unique so that C++14 support will not be necessary for compilation
+template<class T, class... Args,
+	typename std::enable_if<!std::is_array<T>::value, int>::type = 0>
+std::unique_ptr<T> make_unique(Args&&... args)
+{
+    return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+template<class T,
+	typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0, int>::type = 0>
+std::unique_ptr<T> make_unique(std::size_t size)
+{
+	return std::unique_ptr<T>(new typename std::remove_extent<T>::type[size]());
+}
+
+template<class T, class... Args,
+	typename std::enable_if<std::extent<T>::value != 0, int>::type = 0>
+void make_unique(Args&&... args) = delete;
+
+
+template<class T,
+	typename std::enable_if<!std::is_array<T>::value, int>::type = 0>
+	std::unique_ptr<T> make_unique_default_init()
+{
+	return std::unique_ptr<T>(new T);
+}
+
+template<class T,
+	typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0, int>::type = 0>
+	std::unique_ptr<T> make_unique_default_init(std::size_t size)
+{
+	return std::unique_ptr<T>(new typename std::remove_extent<T>::type[size]);
+}
+
+template<class T, class... Args,
+	typename std::enable_if<std::extent<T>::value != 0, int>::type = 0>
+	void make_unique_default_init(Args&&... args) = delete;