SCUMM: Eliminate platform-specific targets
|Reported by:||sev-||Owned by:||sev-|
It would be nice to eliminate platform-specific targets such as monkey1, zaktowns, game etc and base detection on MD5 using GF_MULTIPLE_VERSIONS feature.
Also there should be config file upgrade completely transparent to users. I.e. it will replace legacy targets when found without any additional commands/tools. Only thing which we may consider is printing out some message like 'Upgrading old ScummVM config file'
Ticket imported from: #1091806. Ticket imported from: feature-requests/215.