[Feature Request] Add support for multi-disk titles for Pegasus Frontend

[SoumyBhow]

Hello,
As this is the "community oriented" fork of Skyscraper I'm hoping it's possible to make feature requests here. Else I sincerely apologize.

This feature request can also be found on the original Skyscraper here. The basic idea is to change the way the metadata.pegasus.txt is formated for multi disk entries. The current behavior is that the multi discs are listed as separate games:
game: the game (disc 1)
file: the game (disc 1).chd
game: the game (disc 2)
file: the game (disc 2).chd

However, Pegasus can combine these entries into one:

game: the game
files:
the game (disc 1).chd
the game (disc 2).chd

This is just a crude example. More details can be found on the Pegasus Frontend Website here in the File Format section. Would it be possible to implement this in your fork? Thanks in advance.