[MIRROR] Improves the RPG loot wizard event. [MDB IGNORE] (#22800)

* Improves the RPG loot wizard event. (#77218)

## About The Pull Request
As the title says. Adds a bunch more stat changes to various different
items and a somewhat simple way of modifying them whilst minimizing
side-effects as much as possible.
Added a new negative curse of polymorph suffix that can randomly
polymorph you once you pick up the item.
Curse of hunger items won't start on items that are not on a turf.
Curse of polymorph will only activate when equipped.

Bodyparts, two-handed melees, bags, guns and grenades, to name a few,
have a bunch of type-specific stat changes depending on their quality.

Some items won't gain fantasy suffixes during the RPG loot event, like
stacks, chairs and paper, to make gamifying the stats a bit harder.
I'm sure there'll still be other ways to game the event, but it's not
that big of a deal since these are the easiest ways to game it.
High level items also have a cool unusual effect aura

## Why It's Good For The Game
Makes the RPG item event cooler. Right now, it's a bit lame since
everything only gains force value and wound bonus on attack. This makes
the statistic increases more type-based and make it interesting to use

It's okay for some items to be powerful since this is a wizard event and
a very impactful one too. By making the curse of hunger items not spawn
on people, it'll also make it a less painful event too.

## Changelog
🆑
add: Expanded the RPG loot wizard event by giving various different
items their own statistic boost.
/🆑

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Co-authored-by: Watermelon914 <3052169-Watermelon914@ users.noreply.gitlab.com>

* Improves the RPG loot wizard event.

---------

Co-authored-by: Watermelon914 <37270891+Watermelon914@users.noreply.github.com>
Co-authored-by: Watermelon914 <3052169-Watermelon914@ users.noreply.gitlab.com>

code/game/objects/items/stacks/stack.dm

@@ -20,6 +20,7 @@
 	gender = PLURAL
 	material_modifier = 0.05 //5%, so that a 50 sheet stack has the effect of 5k materials instead of 100k.
 	max_integrity = 100
+	item_flags = SKIP_FANTASY_ON_SPAWN
 	/// A list to all recipies this stack item can create.
 	var/list/datum/stack_recipe/recipes
 	/// What's the name of just 1 of this stack. You have a stack of leather, but one piece of leather
@@ -579,6 +580,8 @@
 		var/obj/machinery/machine = loc
 		if(!(src in machine.component_parts) || !(check in machine.component_parts))
 			return FALSE
+	if(SEND_SIGNAL(src, COMSIG_STACK_CAN_MERGE, check, inhand) & CANCEL_STACK_MERGE)
+		return FALSE
 	return TRUE
 
 /**