Allow "ammo" as ItemPrototypeFilter

[Pi-C]

We already can use

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fuel_items = game.get_filtered_item_prototypes({ {filter = "fuel"} })

to get a list of all items with a fuel_value. Could we get a similar filter "ammo", please? This would make it possible to simply use

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ammo_items = game.get_filtered_item_prototypes({ {filter = "ammo"} })

instead of

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local ammo_items = {}
for i_name, i_proto in pairs(game.item_prototypes) do
  ammo_type = i_proto.get_ammo_type()
  ammo_items[i_name] = ammo_type and ammo_type.category and i_proto
end

[Bilka]

Use this:

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game.get_filtered_item_prototypes({{filter = "type", type = "ammo"}})

Something like filter = "tool" returns everything that is a tool prototype, including its children like repair-tool. Using the "type" filter and an item prototype type (like "ammo") returns only prototypes with that exact type.

[Pi-C]

Use this:

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game.get_filtered_item_prototypes({{filter = "type", type = "ammo"}})

Thanks! That should have been a nobrainer as I've used the 'type' filter before. But I've somehow forgotten that 'ammo' is regarded as an item with just another type … Sorry for the noise!