Add class searching and game searching

[aba4gamer]

When you open a Galaxy in SMG1 Whitehole will detect that the game is SMG1 and therefore the database will show you all the objects that exist in that game. Same happens with SMG2 but maybe an advanced option to pick between the database in SMG1 and SMG2 when you're in SMG2 will be great for the modders who want to use objects from the previous game. Maybe that could show a warning saying that you need the models and add them to the ProductMapObjDataTable, but as I said before it would be an advanced settings option or something like that.

The other thing is the ability to search by classes, not only by name and by internal name.