Add constructable floor lights + mapping subtypes (#93537)

## About The Pull Request
Features:
- Floor lights can be constructed using a small light fixture on the
turf you are standing on
- Floor light construction sprites
- `/burned` subtypes for lights
- Convert `/build` subtypes to `/empty` subtypes with `UpdatePaths`
script

## Why It's Good For The Game
Floor lights can now be constructed in game using the same mechanics as
other lights. The `/burned` and `/empty` subtypes might be useful for
mapping.

## Changelog
🆑
add: Add constructable floor lights by using a small light fixture on
the floor. They are constructed the same way as other lights.
qol: Add `/burned` subtype to `/obj/machinery/light` for mapping
shenanigans
image: Add floor light construction sprites
map: Converted the `/built` subtype for `/obj/machinery/light` to be
`/empty` and added an UpdatePaths script.
/🆑

---------

Co-authored-by: SyncIt21 <110812394+SyncIt21@users.noreply.github.com>

code/modules/power/lighting/light_construct.dm

@@ -141,9 +141,11 @@
 				tool.play_tool_sound(src, 75)
 				switch(fixture_type)
 					if("tube")
-						new_light = new /obj/machinery/light/built(loc)
+						new_light = new /obj/machinery/light/empty(loc)
 					if("bulb")
-						new_light = new /obj/machinery/light/small/built(loc)
+						new_light = new /obj/machinery/light/small/empty(loc)
+					if("floor")
+						new_light = new /obj/machinery/light/floor/empty(loc)
 				new_light.setDir(dir)
 				new_light.find_and_hang_on_wall()
 				transfer_fingerprints_to(new_light)
@@ -169,3 +171,9 @@
 	icon_state = "bulb-construct-stage1"
 	fixture_type = "bulb"
 	sheets_refunded = 1
+
+/obj/structure/light_construct/floor
+	name = "floor light fixture frame"
+	icon_state = "floor-construct-stage1"
+	fixture_type = "floor"
+	sheets_refunded = 1