Add tin as a material and make some "tin" dining items from it.

[pjf]

Summary

SUMMARY: Bugfixes "Tin is now a first-class material, and tin items can be disassembled or smelted into tin scrap."

Purpose of change

Despite scrap "tin" being in game and used in recipes, items described as being made from tin (such as a "tin plate") were instead made from aluminium or other metals.

Describe the solution

I've added "tin" as a material, and changed at least one set of items described as being made of tin to use it.

A few things to note:

• I've used stats for pure white tin, even though the items survivors encounter are likely to actually be tin-alloys.
• I wasn't sure which "latent heat" the JSON was referring to. I've used the latent heat of vaporization. The latent heat of fusion is much, much lower.
• I've not changed the material of tin cans, as these are either made of tin-plated steel, or contain no tin at all.
• I've set burn_products to produce tin scrap, but I'm not 100% sure of the arguments here. I'd appreciate extra checking.
• I wasn't sure of the units used for density. I've used silver as a reference and kinda fudged it.
• I've noticed that my "tin plate" can be immediately disassembled into tin after making this change. I'm not sure if that's a feature or a bug.
• This is my first time making a material, so feedback and corrections muchly appreciated.
• There are almost certainly other tin items in-game that should be changed. I have not done a thorough search for them all.

Describe alternatives you've considered

• Adding the ability to activate "tin" items to scrap them.
• Changing the description of tin items to claim they're not really made from tin.
• Removing tin items altogether.
• Being really pedantic and calling the material "pewter" since most tin items will not actually be pure tin.

[pjf]

And I've realised why my "tin pate" can be disassembled into tin scraps.... It's because materials and items can't have the same name. Standby while I fix things up...

I need to use coffee before using git.

[nexusmrsep]

Hope you are aware of https://en.wikipedia.org/wiki/Tin_pest

[pjf]

I'm very much aware of grey tin and tin pest (and zinc pest!), but I'm not going to be covering those in this PR. :)

[pjf]

Merged already? I guess that means I didn't make any unforseen mistakes. Thank you! :)

[ampersand55]

WTH. I was just doing the same thing!

ampersand55@9a3cb04

[jbytheway]

Given that we have a freezing point but no boiling point in the materials properties I'm fairly sure that the latent_heat field is intended to be the latent heat of fusion.

[ampersand55]

Yes, I believe I have the correct chemical properties in my PR.

The latent heat of fusion for tin is 59 J/g (equivalent to kJ/kg):

https://www.engineeringtoolbox.com/fusion-heat-metals-d_1266.html

Also the specific heat of liquid tin is 0.24.

https://www.engineeringtoolbox.com/liquid-metal-boiling-points-specific-heat-d_1893.html

[pjf]

@ampersand55 : You rock! Have opened a PR with your updates figures and assigned you attribution in git! :)