Address a number of TGUI issues

- SmartFridge has been tweaked to look better
 - ChemMaster no longer puts the units in bottle names by default
 - Trinary filter reads last_flow_rate again
 - Operating computer now works based off percentage of health, rather
   than real health (note, a tesh at -50 won't die until -100, but it'll
   trigger the -100% alarm)
 - Clicking on the knob in the canister UI no longer brings up a number
   input too small to enter values in the valid range. For right now,
   the knob stays, but this may be reconsidered in favor of a
   NumberInput if more people would prefer accessibility over
   skeuomorphism UI design.
 - Pipe dispenser has a bent pipe option again

code/game/machinery/pipe/pipe_dispenser.dm

@@ -52,7 +52,16 @@
 		var/list/r = list()
 		for(var/i in 1 to cat.len)
 			var/datum/pipe_recipe/info = cat[i]
-			r += list(list("pipe_name" = info.name, "pipe_index" = i))
+			r += list(list("pipe_name" = info.name, "ref" = "\ref[info]"))
+			// Stationary pipe dispensers don't allow you to pre-select pipe directions.
+			// This makes it impossble to spawn bent versions of bendable pipes.
+			// We add a "Bent" pipe type with a special param to work around it.
+			if(info.dirtype == PIPE_BENDABLE)
+				r += list(list(
+					"pipe_name" = ("Bent " + info.name),
+					"ref" = "\ref[info]",
+					"bent" = TRUE
+				))
 		data["categories"] += list(list("cat_name" = c, "recipes" = r))
 
 	return data
@@ -68,24 +77,24 @@
 		if("p_layer")
 			p_layer = text2num(params["p_layer"])
 		if("dispense_pipe")
-			if(!wait)
-				var/list/recipes
-				if(disposals)
-					recipes = GLOB.disposal_pipe_recipes
-				else
-					recipes = GLOB.atmos_pipe_recipes
+			if(!wait)				
+				var/datum/pipe_recipe/recipe = locate(params["ref"])
+				if(!istype(recipe))
+					return
 				
-				var/datum/pipe_recipe/recipe = recipes[params["category"]][text2num(params["pipe_type"])]
+				var/target_dir = NORTH
+				if(params["bent"])
+					target_dir = NORTHEAST
 
 				var/obj/created_object = null
 				if(istype(recipe, /datum/pipe_recipe/pipe))
 					var/datum/pipe_recipe/pipe/R = recipe
-					created_object = new R.construction_type(loc, recipe.pipe_type, NORTH)
+					created_object = new R.construction_type(loc, recipe.pipe_type, target_dir)
 					var/obj/item/pipe/P = created_object
 					P.setPipingLayer(p_layer)
 				else if(istype(recipe, /datum/pipe_recipe/disposal))
 					var/datum/pipe_recipe/disposal/D = recipe
-					var/obj/structure/disposalconstruct/C = new(loc, D.pipe_type, NORTH, 0, D.subtype ? D.subtype : 0)
+					var/obj/structure/disposalconstruct/C = new(loc, D.pipe_type, target_dir, 0, D.subtype ? D.subtype : 0)
 					C.update()
 					created_object = C
 				else if(istype(recipe, /datum/pipe_recipe/meter))

code/game/machinery/pipe/pipe_recipes.dm

@@ -79,10 +79,6 @@ GLOBAL_LIST_INIT(disposal_pipe_recipes, list(
 	var/dirtype							// If using an RPD, this tells more about what previews to show.
 	var/pipe_type
 
-// Render an HTML link to select this pipe type. Returns text.
-/datum/pipe_recipe/proc/Render(dispenser)
-	return "<A href='?src=\ref[dispenser]&[Params()]'>[name]</A><BR>"
-
 // Get preview for UIs
 /datum/pipe_recipe/proc/get_preview(selected_dir)
 	var/list/dirs
@@ -123,10 +119,6 @@ GLOBAL_LIST_INIT(disposal_pipe_recipes, list(
 
 	return rows
 
-// Parameters for the Topic link returned by Render().  Returns text.
-/datum/pipe_recipe/proc/Params()
-	return ""
-
 //
 // Subtype for actual pipes
 //
@@ -144,18 +136,6 @@ GLOBAL_LIST_INIT(disposal_pipe_recipes, list(
 		icon_state_m = "[icon_state]m"
 	paintable = ispath(path, /obj/machinery/atmospherics/pipe) && !(ispath(path, /obj/machinery/atmospherics/pipe/vent))	// VOREStation Add
 
-// Render an HTML link to select this pipe type
-/datum/pipe_recipe/pipe/Render(dispenser)
-	var/dat = ..(dispenser)
-	// Stationary pipe dispensers don't allow you to pre-select pipe directions.
-	// This makes it impossble to spawn bent versions of bendable pipes.
-	// We add a "Bent" pipe type with a preset diagonal direction to work around it.
-	if(istype(dispenser, /obj/machinery/pipedispenser) && (dirtype == PIPE_BENDABLE))
-		dat += "<A href='?src=\ref[dispenser]&[Params()]&dir=[NORTHEAST]'>Bent [name]</A><BR>"
-	return dat
-
-/datum/pipe_recipe/pipe/Params()
-	return "makepipe=[pipe_type]"
 
 //
 // Subtype for meters
@@ -168,9 +148,6 @@ GLOBAL_LIST_INIT(disposal_pipe_recipes, list(
 /datum/pipe_recipe/meter/New(label)
 	name = label
 
-/datum/pipe_recipe/meter/Params()
-	return "makemeter=1"
-
 //
 // Subtype for disposal pipes
 //
@@ -185,9 +162,3 @@ GLOBAL_LIST_INIT(disposal_pipe_recipes, list(
 	subtype = sort
 	if (dirtype == PIPE_TRIN_M)
 		icon_state_m = replacetext(state, "j1", "j2")
-
-/datum/pipe_recipe/disposal/Params()
-	var/param = "dmake=[pipe_type]"
-	if (subtype)
-		param += "&sort=[subtype]"
-	return param