Add support to take into account empty sockets when assuming socketed

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• I'm running the latest version of Path of Building and I've verified this by checking the changelog

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What is the value from the calculation in-game?

In game my Total Health value is 19243. In my build I have 17 empty red sockets, 0 empty green sockets, 0 empty blue sockets, and 0 empty white sockets. This leads to Untouched Soul granting (17 * 40) max life (total 680) and after everything else in the build brings the total to 19243.

What is the value from the calculation in Path of Building?

In Path of Building, my Total Health value shows 18763. Without setting additional configuration options to overwrite the expected sockets from Untouched Soul, PoB calculates 600 max life, 40 max mana, and 225 accuracy rating. This would be the result of 15 empty red sockets, 1 empty green sockets, 1 empty blue sockets, and 0 empty white sockets. This leads to Untouched Soul granting (15 * 40) max life (total 600) instead of the correct (17 * 40) max life from empty red sockets.

The issue as far as I can determine is because of the order of the sockets on my Body Armour which is socketed as Red Red Red Red Green Blue or RRRRGB. I have 4 gems socketed in the lower half of the chest piece leaving the first two red sockets free. It seems that the 4 skill gems in the item are socketed in the first 4 slots regardless of color instead of skill gems adhering to their color (since green and blue are spots 5 & 6 in this case respectively)

How to reproduce the issue

1. Equip "The Untouched Soul, Gold Amulet"
2. Using a 6 socket (links not important) body armour, place gems in any of the lower sockets but NOT the first two sockets.
3. At this point PoB will have calculated the stats from Untouched Soul wrong because when 4 items are socketed in the body armour they are assumed to be be in the first available sockets (color doesn't seem to matter)

Character build code

https://pobb.in/88G9VsD9oTih

Screenshots

Use the linked pobb.in build and follow the reproduction steps with The Untouched Soul and a six-socket body armour whose lower sockets contain gems. Compare PoB's assumed empty socket colours and resulting Untouched Soul stats with the in-game values; done means the calculation counts the actual empty sockets regardless of their socket positions.