Properly check/uncheck dependencies

[DrakiaXYZ]

Not the prettiest code, but it does seem to properly handle checking/unchecking dependencies properly.

If you notice any cases that aren't working, let me know, and I can look into it.

[DrakiaXYZ]

Got some feedback from Assistant on this, suggestions:

1. Shouldn't be able to unselected depended on mods at all
2. Restore the checked state of a depended on mod when unselected the mod that depended on it (For example, if from nothing selected, you select ScoreSaber, it will select Harmony. If you then unselect ScoreSaber, unselect Harmony)

I'll see about getting some time to look more at this tomorrow.