add Fox Engine

[diedyesterdaywastaken]

SteamDB app page links to a few games using this

• EFootball PES 2020
• EFootball PES 2021 Season Update
• Metal Gear Solid V: Ground Zeroes
• Metal Gear Solid V: The Phantom Pain
• Metal Gear Survive
• Pro Evolution Soccer 2014
• Pro Evolution Soccer 2015
• Pro Evolution Soccer 2016
• Pro Evolution Soccer 2016 myClub
• Pro Evolution Soccer 2017
• Pro Evolution Soccer 2017 Trial
• Pro Evolution Soccer 2018
• Pro Evolution Soccer 2018 Lite
• Pro Evolution Soccer 2019
• Pro Evolution Soccer 2019 Lite

Brief explanation of the change

[SteamDB-Tracker]

After running changed rules in this pull request (this bot only tests rules.ini changes):

Changed technologies: Engine.Fox_Engine

These apps now match: (22) 250870 287680 287700 311340 321280 375960 376890 407250 456610 499050 541180 543900 592580 592590 592600 770240 797470 888680 950100 996470 996480 1259970

Please confirm that all these changed apps are correct.