Unify the way to report unknown versions of games
|Reported by:||jvprat||Owned by:||sev-|
The attached patch puts in a function the code that lets the user know that this version of the game is unknown, and it shows useful information to detect it, so it can also be used from the fallback detection functions. Otherwise, each custom fallback function should have its own way to report unknown versions.
Ticket imported from: #1814831. Ticket imported from: patches/835.