Compare active/installed mods with mods/version required by saves

[atlanticaccent]

Saves store mod IDs and mod versions that they were created with, to ensure compatibility and display the warning indicating mods present in the save are not loaded.

Retrieve this list of mods from the saves, and run an iterative comparison between it and the current installed mods, as well as the mods that are installed and active.

Potentially provide the ability to toggle mods on and off based on the mods present in a save, if they are available in the mods folder.