Support to open games save and configuration directories

[darklinkpower]

Similar to supporting opening the backup directories, I think it would be great to be able to open the save directories. Along time ago I made a separate extension for this but I'm not maintaining it anymore and the code is a mess to be honest. I think it would make more sense for this to be available as a feature in Ludusavi Playnite itself, by obtaining this directly from Ludusavi.

I remember the implementation needed to do this:

• Only open the generic platform directories and the ones specific for the platform. e.g. if it's a Steam game, it won't open the GOG directories if they are different and vice versa.
• It needs to open only the common root directories rather than all of them. For example, if the available paths are C:\Users\Username\Documents\SavedGames\SomeGame\Directory1 and C:\Users\Username\Documents\SavedGames\SomeGame\Directory2, it should open the C:\Users\Username\Documents\SavedGames\SomeGame in Explorer
• The same needs to apply to files.