Metal Foam rebalance.

[private-tristan]

About the pull request

Increases the xeno damage multiplier against foam from 0.8x to 1.75x (and decreasing iron foam hp from 85 to 70), meaning that combat t2s xenos will be able to 1shot aluminum metal foam, but only T3s can 1shot iron metal foam.

makes damage consistent against foam so that the queen/crusher/basePrae don't randomly fail to smash it in a single hit.

aluminium foam now is cap'd at 300u.

iron foam is no longer able to be created by chemistry

foam grenades now use iron foam
increased amount of iron foam grenades in req
surplus explosives crate now contains 2 metal foam grenades

To make metal foam grenades (the ones that are bought from vendors/req) not completely useless, they now use metal foam, which (as said above) will be able to stop T1s and T2s in their tracks.

Explain why it's good for the game

Currently, metal foam when detonated in a reagent tank is able to flood an entire area of the map with metal foam, causing it to be near impossible for xenos to get past without spending 10 minutes clicking on foam. Meanwhile, marines are able to 1shot all foam using either bullets or a BOOT KNIFE. a giant alien with scythes for hands is slower at clearing out a chunk of metal foam than a human with a boot knife.

With this PR, metal foam will be significantly worse at stopping T2s and T3s. Buffing iron foam allows

Testing Photographs and Procedure

Testing

300u metal foam maxcap: (outdated, only aluminium foam can be created, but size should be the same)

foam changes (heavily compressed because github only allows 10mb)

Foam.Changes.Compressed.mp4

Changelog

🆑
balance: Xenos do greatly increased damage to metal foam (0.8x to 1.75x)
balance: Iron metal foam hp decreased from 85 to 75, meaning that all T3s other than boiler can instantly break it.
balance: Metal foam grenades now create iron foam.
balance: Aluminum foam reactions are now cap'd at 300u
balance: amount of metal foam grenades in req doubled.
balance: Surplus explosive pack now contains 2 metal foam grenades
del: metal foam is no longer able to be created in chemistry
/:cl:

[harryob]

github is for code review, not for balance insight ->>> https://forum.cm-ss13.com/w/pr-feedback