Adjust objects to tabletop when wrenched (#75671)

![dreamseeker_2f6HEd87Kb](https://github.com/tgstation/tgstation/assets/3625094/c272df94-cdb6-427e-a3dc-c0e7d9cca4ea)

## About The Pull Request

Added a variable to `/obj/` that can be set to adjust the object sprite
when it mapspawns or being wrenched on top of a table.

Set this variable for some popular tabletop machines, removing the
default `pixel_y` offsets for some of them.

Also moved the wrenching logic to /obj/. It was under machinery for some
reason.

## Why It's Good For The Game

Did you ever unwrench something from the table by accident and then was
annoyed that you can't revet it back?

## Changelog

🆑
qol: Objects have a variable to adjust them visually when they're
wrenched or spawned on a table
refactor: Removed redundant code that had similar purpose, moved `obj`
wrenching logic into the `objs.dm`
qol: food/slime processor can be moved on table and adjusts to it when
wrenched
/🆑

code/modules/reagents/chemistry/machinery/chem_dispenser.dm

@@ -476,7 +476,7 @@
 	has_panel_overlay = FALSE
 	dispensed_temperature = WATER_MATTERSTATE_CHANGE_TEMP // magical mystery temperature of 274.5, where ice does not melt, and water does not freeze
 	amount = 10
-	pixel_y = 6
+	anchored_tabletop_offset = 6
 	circuit = /obj/item/circuitboard/machine/chem_dispenser/drinks
 	working_state = null
 	nopower_state = null

code/modules/reagents/chemistry/machinery/reagentgrinder.dm

@@ -10,6 +10,7 @@
 	circuit = /obj/item/circuitboard/machine/reagentgrinder
 	pass_flags = PASSTABLE
 	resistance_flags = ACID_PROOF
+	anchored_tabletop_offset = 8
 	var/operating = FALSE
 	var/obj/item/reagent_containers/beaker = null
 	var/limit = 10