[MIRROR] Basic pollen-particles for plants pollenating. [MDB IGNORE] (#20592)

* Basic pollen-particles for plants pollenating. (#74675)

Legally endorsed nightcode 👍

## About The Pull Request

When 2 plants are adjacent to each other, they will begin to
cross-pollenate, sharing their potency, instability, and yield values
between the two. This has been in the game since #50001 , however we
never added a more clear visual tell that cross-pollenation exists.
Thanks to the magic of *barticles*, now you can!

![image](https://user-images.githubusercontent.com/41715314/231359363-07c7f354-d2f6-4d5e-8b59-5f968781135f.png)
_pictured: wheat and tomatoes pollenating_

Adds a simple particle effect, largely lifted from bonfires, that
indicates that two plants are sharing stats at minimum.

## Why It's Good For The Game

Following discussion from #74621, it was decided we needed and preferred
a more visual cue to the mechanic. As a general point I think that's a
longer term fix to the issue, and this adds more visual clarity to an
otherwise arcane mechanic (heh).

Looking for feedback on how to improve the look of the particles but for
fast nightcode I think I did okay for a first try

## Changelog

🆑
imageadd: Hydroponics trays now have pollen particles that they generate
when they share stats and chems. Non-allergenic!
/🆑

---------

Co-authored-by: san7890 <the@ san7890.com>

* Basic pollen-particles for plants pollenating.

---------

Co-authored-by: ArcaneMusic <41715314+ArcaneMusic@users.noreply.github.com>
Co-authored-by: san7890 <the@ san7890.com>

code/datums/components/echolocation.dm

@@ -180,17 +180,3 @@
 /atom/movable/screen/fullscreen/echo/Destroy()
 	QDEL_NULL(particles)
 	return ..()
-
-/particles/echo
-	icon = 'icons/effects/particles/echo.dmi'
-	icon_state = list("echo1" = 1, "echo2" = 1, "echo3" = 2)
-	width = 480
-	height = 480
-	count = 1000
-	spawning = 0.5
-	lifespan = 2 SECONDS
-	fade = 1 SECONDS
-	gravity = list(0, -0.1)
-	position = generator(GEN_BOX, list(-240, -240), list(240, 240), NORMAL_RAND)
-	drift = generator(GEN_VECTOR, list(-0.1, 0), list(0.1, 0))
-	rotation = generator(GEN_NUM, 0, 360, NORMAL_RAND)