Tutorial Videos Added - v0.5.0.53

Tutorial now has several example videos, showing where to find the structures/items in the build menu and how to apply their construction. At the moment, i've focused on the initial power, walls, floors and items where someone starting out may need help. But more to add, so do let me know what extra videos would help.

Patch notes:-

• Added video examples to several pages of the tutorial.
  
• Improve: Wall construction, worker now prefers move to a floor location, not an external space.
  
• Fix: Worker FX not stopping immediately at end of job (Weld/Charge/Mop/Foam).