Adds saltpetre crystals, which grind into saltpetre (#25050)

* Added saltpeter crystal, a way to make them, and sprites.

* comment changes

* forgot to undef

* actually undefing this time

* raises saltpeter crystal yield when ground to 8

I did some play testing and it simply takes too many clicks to pump in the ammonia required to get the amount of saltpeter you need.

* The compost bin being full of compost no longer hinders your saltpetre production

* rebuild TGUI

* Allows the compost bin to accept ammonia directly from plants that contain it

* adding the K back to KNO3

* Minor ui adjustments

* Compost bin can use ash now

* I am made of stupid.

* fixing a tiny little offset in the biomass bar

* Icon update, new description for Saltpetre crystals, style fixes and recompile tgui

* period

* minor changes

* rebuild TGUI

* Apply suggestions from code review

Signed-off-by: Matt <116982774+Burzah@users.noreply.github.com>

---------

Signed-off-by: Matt <116982774+Burzah@users.noreply.github.com>
Co-authored-by: Burzah <116982774+Burzah@users.noreply.github.com>

code/modules/reagents/chemistry/machinery/reagentgrinder.dm

@@ -29,6 +29,7 @@
 		/obj/item/stack/sheet/mineral/tranquillite = list("nothing" = 20),
 		/obj/item/stack/sheet/mineral/silver = list("silver" = 20),
 		/obj/item/stack/sheet/mineral/gold = list("gold" = 20),
+		/obj/item/stack/sheet/saltpetre_crystal = list("saltpetre" = 8),
 
 		// Blender Stuff
 		/obj/item/food/snacks/grown/tomato = list("ketchup" = 0),