Audio updates and more!

This update adds some more sounds for different sorts of materials, as well as audio leveling - now the default for all audio levels is halfway across the settings bar, and the default audio levels should be much more reasonable. :)

Ethanol can burn now (very quickly)!

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[p align="start"]Also a lot of other details:

• CONTENT: materials can now play sand, metal, or rock sound sets when settling

• CONTENT: made Ethanol flammable and added vapor phase

• CONTENT: added a reaction between Lithium Manganese Oxide and Sulfuric Acid to get us out of a material dead end

• Quality-of-Life: show the last-played date/time on the World buttons in the Select World screen

• MUSIC: added a track to the surface biome music rotation, and added a system to make the game pick fewer recently-heard tracks

• BUGFIX: prevented combustion from allowing products to escape through sealed diagonals

• BUGFIX: some materials would incorrectly show their sources as Sand; this is now fixed

• BUGFIX: fixed reactions of sulfuric acids with metals so they produce the correct outputs (was creating an excess of sulfur previously)

• BUGFIX: added missing localized strings for a lot of biome 3 and biome 4 materials that were missing them

• BUGFIX: repeatedly changing localization setting would make fonts shrink a lot in certain situations - fixed this

• BUGFIX: allow wider text fields in the Upgrade Tooltip to avoid some word wrap formatting issues

• POLISH: when clicking a player inventory material, show the material flying down into the inventory HUD slot

• POLISH: added souds effects that play when clicking a player inventory material

• POLISH: added tooltips for the Toggleable Tools (Helmet, Jetpack, Flashlight, etc.), and the ability to click the icons to toggle them