LoadAppinfo takes too long

[SomeoneIsWorking]

I've noticed plugin startup takes more than ~3200ms seconds and ran debugger from source and it halts the most on LoadAppinfo and replaced the plugin from the builds generated without LoadAppinfo and load time went down to ~200ms

Update 1: Apparently it's because of serializing/deserializing BinaryVdfItem.
I forked it and it appears only Icon is used from BinaryVdfItem so I'm going to store the used fields in a separate class and cache it instead.

Update 2: I pushed the updates to my fork, it "works", icons show up, startup time is ~400ms but I compulsively edited a lot of other parts of code and most of the changes are in a single commit so I don't know if you would want to merge it here.

[SkaceKamen]

I didn't really focus on the initialize time optimizations as originally I wasn't even planning on publishing the extension :).

You can try to create a pull request and I'll try to review it.