[Improvement] Scan for AddOns on startup

[Seroczynski]

I wanted to clear my AddOn folder to start with a clean sheet and install a large amount of new AddOns, so I manually removed all the folders from my ESO AddOn folder.

When I started Minion, I noticed all my AddOns were listed in the "Installed" tab as if they were never removed. It even showed when an AddOn required an update. This made me think that the list of installed AddOns is saved in Minion, and not being scanned for on startup.

I installed a few AddOns, noticed I didn't like them and restored my backup. Same thing happens now, the "Installed" tab is showing the wrong AddOns. I might have to delete a file somewhere holding this configuration, so that doesn't seem like a big hassle, but it leaves room for improvement.