Another set of QoL and changes for IC (#6317)

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## About The Pull Request

This PR aims to solve a few things random things I have collected in my
to do list of issues and QoL.

First of, trignometry! You can now use the inverse function of sin, cos
and tan including atan2 because it is cool.
Mini fixes of the debug printer having no metal, a few reagent
containers having no ref pushes and resolving a few invisible icons. Not
to mention the external battery scanner being to near useless with no
adjecant check.
Lasty the two major things is that the injector now finally works, you
can draw blood, inject it properly and you can't inject someone else
with it if they are wearing armor. Second is the medical scanner is now
able to output nutrition, reagent types and quantity.

Late edit: Also added Min and Max math circuitry. Fixed and reenabled
filters plus a view filter that ties into it

code/modules/integrated_electronics/core/printer.dm

@@ -37,6 +37,7 @@
 /obj/item/integrated_circuit_printer/debug
 	name = "fractal integrated circuit printer"
 	desc = "A portable(ish) machine that makes modular circuitry seemingly out of thin air."
+	cur_metal = 250
 	debug = TRUE
 	upgraded = TRUE
 	can_clone = TRUE