[MIRROR] Many bug fixes, QoL, and PDA notes port (now with sensible diffs) (#7588)

Co-authored-by: Heroman3003 <31296024+Heroman3003@users.noreply.github.com>
Co-authored-by: Nadyr <41974248+Darlantanis@users.noreply.github.com>
Co-authored-by: Nadyr <forlirnglacignis@gmail.com>

code/modules/materials/materials/_materials.dm

@@ -213,6 +213,7 @@ var/list/name_to_material
 	var/luminescence
 	var/radiation_resistance = 0 // Radiation resistance, which is added on top of a material's weight for blocking radiation. Needed to make lead special without superrobust weapons.
 	var/supply_conversion_value  // Supply points per sheet that this material sells for.
+	var/can_sharpen = TRUE // Is this material compatible with a sharpening kit?
 
 	// Placeholder vars for the time being, todo properly integrate windows/light tiles/rods.
 	var/created_window

code/modules/materials/materials/plastic.dm

@@ -109,3 +109,4 @@
 	weight = 1
 	protectiveness = 0 // 0%
 	conductive = 0
+	can_sharpen = FALSE