Refactors projectile ricochets (#25764)

* same taste, twice the speed

* pulls proc/handle_ricochet() to the atom level. adds var/flags_ricochet and related defines.

* space indentation sneaks its way in yet again

---------

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>

code/game/turfs/simulated/walls.dm

@@ -24,6 +24,7 @@
 	explosion_block = 1
 
 	flags_2 = RAD_PROTECT_CONTENTS_2 | RAD_NO_CONTAMINATE_2
+	flags_ricochet = RICOCHET_HARD
 	rad_insulation = RAD_MEDIUM_INSULATION
 
 	thermal_conductivity = WALL_HEAT_TRANSFER_COEFFICIENT
@@ -154,17 +155,6 @@
 	else
 		update_icon()
 
-/turf/simulated/wall/handle_ricochet(obj/item/projectile/P)			//A huge pile of shitcode!
-	var/turf/p_turf = get_turf(P)
-	var/face_direction = get_dir(src, p_turf)
-	var/face_angle = dir2angle(face_direction)
-	var/incidence_s = GET_ANGLE_OF_INCIDENCE(face_angle, (P.Angle + 180))
-	if(abs(incidence_s) > 90 && abs(incidence_s) < 270)
-		return FALSE
-	var/new_angle_s = SIMPLIFY_DEGREES(face_angle + incidence_s)
-	P.set_angle(new_angle_s)
-	return TRUE
-
 /turf/simulated/wall/dismantle_wall(devastated = FALSE, explode = FALSE)
 	if(devastated)
 		devastate_wall()

code/game/turfs/simulated/walls_mineral.dm

@@ -220,7 +220,7 @@
 	icon_state = "plastinum_wall-0"
 	base_icon_state = "plastinum_wall"
 	explosion_block = 3
-	flags_2 = CHECK_RICOCHET_2
+	flags_ricochet = RICOCHET_SHINY | RICOCHET_HARD
 	sheet_type = /obj/item/stack/sheet/mineral/titanium
 	smoothing_flags = SMOOTH_BITMASK | SMOOTH_DIAGONAL_CORNERS
 	smoothing_groups = list(SMOOTH_GROUP_TITANIUM_WALLS, SMOOTH_GROUP_WINDOW_FULLTILE_SHUTTLE)