Adds smooth movement/atom gliding, buffs everyone's speed by 2x. (#21662)

Revives https://github.com/Aurorastation/Aurora.3/pull/17215 with the
needed species changes.

As I said last time this was tried, the key issue is that our walkspeed
is a lot lower than any other server's. Even if we add atom gliding as
is, it would just look like gliding through molasses and would give you
motion sickness, because it takes a half-second to finish a glide to
another tile. Meaning that to compensate the movement speed has now been
significantly buffed for everyone. Yes, even dionae, G2, simple mobs,
everyone.

As compensation, m'sai/bishop/unathi sprint were especially nerfed
because otherwise they'd go lightspeed.



https://github.com/user-attachments/assets/7ba07389-b874-4a7d-8dd5-b5d3bfe611e4

---------

Signed-off-by: Matt Atlas <mattiathebest2000@hotmail.it>
Co-authored-by: Matt Atlas <liermattia@gmail.com>
Co-authored-by: VMSolidus <evilexecutive@gmail.com>
Co-authored-by: Batrachophreno <Batrochophreno@gmail.com>

code/game/objects/items/weapons/vaurca_items.dm

@@ -298,7 +298,7 @@
 	icon_state = "scout"
 	item_state = "scout"
 	desc = "Armor designed for K'laxan scouts, made of lightweight sturdy material that does not restrict movement."
-	slowdown = -1
+	slowdown = -0.2
 
 	species_restricted = list(BODYTYPE_VAURCA)
 	armor = list(