add a toggle for the standard canSaveDynamicFields flipped by default to off so folks can bolt variables on the fly onto the spawner (like thing spawned, how many ect) without it poluting level saves

Templates/BaseGame/game/tools/worldEditor/gui/objectBuilderGui.ed.gui

@@ -1082,6 +1082,7 @@ function ObjectBuilderGui::buildGeneralDropPoint(%this)
    %this.addField("spawnClass",     "TypeString",    "Spawn Class", "");
    %this.addField("spawnDatablock", "TypeString", "Spawn Data", "");
    %this.addField("spawnTransform", "TypeBool", "Spawn Here", "true");
+   %this.addField("canSaveDynamicFields", "TypeBool", "Save metadata", "false");
    %this.process();
 }