Revert "Project modernization (#630)"

This code was not tested and breaks in Release builds, reverting to restore
functionality of the nightly. All in-game menus do not work and generating
a world crashes.

This reverts commit a9be52c41a.

Minecraft.World/HtmlString.cpp

@@ -38,7 +38,7 @@ wstring HtmlString::ToString()
 
 wstring HtmlString::Compose(vector<HtmlString> *strings)
 {
-	if (strings == nullptr) return L"";
+	if (strings == NULL) return L"";
 
 	std::wstringstream ss;