Experimental JATO and Ram Plow for Everything 2.7

This is a pretty big update that changes and adds a lot of stuff:

• Roof-mounted rockets are now separately selectable in a new slot. You can even put 3 at the same time now:
  
• Side rockets are now default instead of the roof one because people use these more often
  
• Added message displayed on vehicle reset when JATO equipped:
  
• Moved roof rocket position tuning to a different category, for compatibility reasons:
  
• Changed range of roof up offset and side front offset
• Added beacon lights and light bar, the setup is exactly the same as for the roof rocket:
  
• Added the ball prop as roof accessory as per request of WhyBeAre's comment section, again the same setup:
  
  
• Increased max rocket fuel
  
• Fixed instability when installing ram plow on Covet after 0.21.1, the ram plow should be now fully compatible with Covet and all mods based on it
  
• Changed a lot of Jbeam, replaced manual node coordinate edit with nodeMove in most parts to make it easier to add new stuff in the future
• Fixed bug with the rockets breaking glass on some cars even if not connected. They still do break glass but that's from the weight
• Fixed typos
  
• Probably I changed some more stuff but I forgot