Refinement of the main functions

Hi.
1. You need to make it possible to perform tasks inside the quest strictly in order. Now the tasks inside the quest can be performed in any order. Make it so that the tasks inside the quest can be performed strictly one after the other.
2. Make it so that the completion of the quest could be the beginning for another new quest. Now we need to pass the quest to get a new one.
3. Make markers for objects with a distance indicator to the target and the markers themselves should be visible through all objects, walls and ceilings.