Tram signal and station improvements (#71315)

## About The Pull Request
-New sprites for tram crossing signals in titanium, acting as an
extension of the railing/decals in front of the tram, acting like an
anchor for the end of the railing instead of the misaligned corner, with
a more futuristic look.
-The speed of amber/red flashing is slowed a bit from current to be less
distracting.
-Redo of the decals on the floor in front of the tram, it was leading
you into the vending machine.
-Like any tram, the yellow hazard bump floor tiles in the station.
-Moved the vending machines to be flush with the wall.


![image](https://user-images.githubusercontent.com/83487515/202982631-1d1c7f55-b7c9-4395-8c82-13d706e91acc.png)


## Why It's Good For The Game
Tram TLC, looks more space station-like
## Changelog
🆑 LT3
imageadd: New railing pillar tram crossing signals.
qol: Vending machines next to the tram are now against the wall.
fix: Tramstation floor decals no longer guide you to walk into the
vending machines.
add: The tram stations now have no-slip hazard floor tiles so you don't
accidentally slip and get smacked. Feel free to still run into it
anyways, medbay has a counter now so they'll know.
/🆑

code/game/objects/effects/decals/turfdecal/tilecoloring.dm

@@ -607,6 +607,9 @@
 /obj/effect/turf_decal/trimline/white/warning
 	icon_state = "trimline_warn"
 
+/obj/effect/turf_decal/trimline/white/tram
+	icon_state = "trimline_tram"
+
 /obj/effect/turf_decal/trimline/white/mid_joiner
 	icon_state = "trimline_mid"