#11 Sorting games by order on .map file

An option to have the games sorted as entered on the .map file
would be nice to prevent this kind of situation:

Mortal
Kombat
Mortal Kombat 3
Mortal Kombat
II
...
several other games here
...
Ultimate Mortal
Kombat 3

If this option was implemented, the (internal?)
sorting would be only enabled if there was no .map file. Or, if there's a
rom in the rom directory, but its name is not defined in the .map file, it
would be thrown at the end of the list.