[FEATURE] New Vending machine hacking wire: reduce prices.

[The Grim Sleeper]

Snip a wire in the Vending machine hacking interface to change the prices!
No more $20 styptic powder mini-patch.

Edit:
So I was sitting here, very busy wasting time, and then suddenly I coded all over my screen!

Ergo a patch: it adds a 5th wire to all vending machines. If the wire is cut, all items are sold at a discount!
Well most items are sold at a discount, things like booster packs and stuff goes full price of course.

Technical stuff

• Discounts can be set for each item individually.
  
• Discounts default to 0, iow, no discount. In case there is some hidden vending machine not in this code, it should not be noticeably affected by the patch.
  
• I set it so items which cost less then $2 normally are free when bought at discount price. This works surprisingly well; no need to have a token amount of money in the machine.
  
• Most other items have their price cut to just below half of the original cost.
  
• If some future person wants to have some fun, you can cut the price of an item to a negative value; This works fine, the machine will magically print you extra money. Just don't tell the QM.
  
• I've had to had 4 new lines to global.dm. Pretty self explanatory, and I hope it will pave the road for more innovative  "electrical engineering".
  

Code:

• Compare
  
• Patch
  

Special thanks to Cirral for helping me put on GitHub.

Edit: Update: Yes, obviously I tested the code with the 2016 release v510 build and yes it works fine.