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.Client/Common/Network/SessionInfo.h

@@ -113,7 +113,7 @@ public:
 
 	FriendSessionInfo()
 	{
-		displayLabel = nullptr;
+		displayLabel = NULL;
 		displayLabelLength = 0;
 		displayLabelViewableStartIndex = 0;
 		hasPartyMember = false;
@@ -121,7 +121,7 @@ public:
 
 	~FriendSessionInfo()
 	{
-		if (displayLabel != nullptr)
+		if (displayLabel != NULL)
 			delete displayLabel;
 	}
 };