- revert changes in backend code which will not sync properly with raze

This is a combination of 2 commits.

Revert "New API for assigning unique network ids to objects"

This reverts commit e37c19b5b4.

 This is the commit message #2:

Revert "Fix for Morph virtual"

This reverts commit 0ef042562e.

src/d_main.cpp

@@ -3101,8 +3101,6 @@ static int FileSystemPrintf(FSMessageLevel level, const char* fmt, ...)
 
 static int D_InitGame(const FIWADInfo* iwad_info, std::vector<std::string>& allwads, std::vector<std::string>& pwads)
 {
-	NetworkEntityManager::InitializeNetworkEntities();
-
 	if (!restart)
 	{
 		V_InitScreenSize();