data-files

Experimenting with undocumented data file mounters in fxmanifest.lua

Initial research (Credit to Noor_Nahas):

https://docs.google.com/spreadsheets/d/1O-7dTrOIQ_RCzfc5EzD46Mv-iWeEIvCHnkmCLs6CijI/edit?usp=sharing