Add vampire ability permission check

Adds a new mob proc that allows checking if vampiric abilities should function. Allows easily checking anti-magic, trait holy, garlic necklace, garlic blood, and staked status.

Bloodfledge actions and coffin healing will now use this check. Flight potions will warn bloodfledge quirk users before allowing consumption.

modular_splurt/code/modules/mining/lavaland/necropolis_chests.dm

@@ -0,0 +1,26 @@
+// Potion of flight
+/obj/item/reagent_containers/glass/bottle/potion/flight/attack(mob/living/target, mob/living/user)
+	// Check for self attack
+	// Check for carbon target
+	if((target != user) || (!iscarbon(user)))
+		// Return normally
+		return ..()
+
+	// Check for bloodfledge
+	if(HAS_TRAIT(user, TRAIT_BLOODFLEDGE))
+		// Define list of options
+		var/list/prompt_options = list("Confirm", "Cancel")
+
+		// Prompt user for input
+		var/input_warning = tgui_alert(user, "You sense that drinking this may be a bad idea. Are you sure you'd like to continue?",src,prompt_options)
+
+		// Sanitize input
+		sanitize_inlist(input_warning, prompt_options)
+
+		// Check if input was NOT confirmation
+		if(input_warning != "Confirm")
+			// Return without results
+			return
+
+	// Return normally
+	. = ..()