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/atoms_movable.dm

@@ -1,8 +1,8 @@
 /atom/movable
 	layer = OBJ_LAYER
-	glide_size = 6
+	glide_size = 8
 	animate_movement = SLIDE_STEPS
-	appearance_flags = DEFAULT_APPEARANCE_FLAGS | TILE_BOUND
+	appearance_flags = DEFAULT_APPEARANCE_FLAGS | TILE_BOUND | LONG_GLIDE
 
 	var/last_move = null
 	/// A list containing arguments for Moved().
@@ -1070,3 +1070,10 @@
 /atom/movable/proc/afterShuttleMove(obj/effect/shuttle_landmark/destination)
 	if(light)
 		update_light()
+
+/atom/movable/proc/set_glide_size(target = 8)
+	if (HAS_TRAIT(src, TRAIT_NO_GLIDE))
+		return
+	SEND_SIGNAL(src, COMSIG_MOVABLE_UPDATE_GLIDE_SIZE, target)
+	glide_size = target
+

code/game/gamemodes/technomancer/core_obj.dm

@@ -285,7 +285,7 @@
 	energy = 7000
 	max_energy = 7000
 	regen_rate = 70 //100 seconds to full
-	slowdown = -1
+	slowdown = -0.3
 	instability_modifier = 0.9
 	cooldown_modifier = 0.9
 

code/game/gamemodes/technomancer/devices/boots_of_speed.dm

@@ -10,7 +10,7 @@
 	desc = "The latest in sure footing technology."
 	item_flags = ITEM_FLAG_NO_SLIP
 	siemens_coefficient = 0.6
-	slowdown = -1
+	slowdown = -0.3
 	armor = null
 
 	cold_protection = FEET

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(