[2.0] Add “Item Obtained” type in TechnologyTrigger

[DemerNkardaz]

I checked the TechnologyTrigger and noticed that it does not include triggers for item obtaining. Perhaps we should consider adding it?

For example, we have a technology called “Charcoal Processing” and we could set “research_trigger = {type="(obtain or mine)-item", item="wood", count=10}” to unlock the Charcoal recipes when the player collects 10 wood items by mining various trees or another way.

It may be useful for various scenarios, when is better idea to research technologies through item obtaining instead of item craft or entity mining.