add FromSoftware Engine

[diedyesterdaywastaken]

SteamDB app page links to a few games using this

• Armored Core VI: Fires of Rubicon
• Dark Souls II
• Dark Souls II: Scholar of the First Sin
• Dark Souls III
• Dark Souls Remastered
• Dark Souls: Prepare to Die Edition
• Elden Ring
• Ninja Blade
• Sekiro: Shadows Die Twice

Brief explanation of the change

Added a rule to detect files used in games made by FromSoftware.

While this engine hasn't been mentioned officially, looking at the file structure + how the games feel and look, they probably have an engine to make these games.

[SteamDB-Tracker]

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

Changed technologies: Engine.FromSoftware, Engine.Frostbite

31 apps still match.

These apps now match: (14) 12600 37010 211420 236430 335300 338070 338090 338100 374320 570940 814380 1245620 1888160 2414360

Please confirm that all these changed apps are correct.