global.set has been implemented, but not diff xmit for globals

luprex/cpp/core/world-core.cpp

@@ -74,6 +74,9 @@ World::World(WorldType wt) {
     // Clear the clock.
     clock_ = 0;
 
+    // Initialize global variable state.
+    next_gvar_assign_ = 1;
+
     // There shouldn't be any lua errors in the sourceDB at this
     // point, since there's no lua code in the sourceDB.
     assert(srcerrs == "");