[DNM][DNM][WIP] Projectile backend code port and update

Ports#54924,  #65061, #59804 from /tg.
adds auxiliary code from /tg to make code work.

code/game/turfs/closed.dm

@@ -6,6 +6,7 @@
 	blocks_air = 1
 	rad_flags = RAD_PROTECT_CONTENTS | RAD_NO_CONTAMINATE
 	rad_insulation = RAD_MEDIUM_INSULATION
+	pass_flags_self = PASSCLOSEDTURF
 	wave_explosion_block = 10
 	wave_explosion_multiply = 0.75
 	/// How much we block yelling
@@ -23,11 +24,6 @@
 /turf/closed/get_smooth_underlay_icon(mutable_appearance/underlay_appearance, turf/asking_turf, adjacency_dir)
 	return FALSE
 
-/turf/closed/CanPass(atom/movable/mover, turf/target)
-	if(istype(mover) && (mover.pass_flags & PASSCLOSEDTURF))
-		return TRUE
-	return ..()
-
 /turf/closed/indestructible
 	name = "wall"
 	icon = 'icons/turf/walls.dmi'

code/game/turfs/simulated/chasm.dm

@@ -77,9 +77,6 @@
 		else
 			to_chat(user, "<span class='warning'>The plating is going to need some support! Place metal rods first.</span>")
 
-/turf/open/chasm/CanPass(atom/movable/mover, turf/target)
-	return 1
-
 // Chasms for Lavaland, with planetary atmos and lava glow
 /turf/open/chasm/lavaland
 	initial_gas_mix = LAVALAND_DEFAULT_ATMOS

code/game/turfs/turf.dm

@@ -225,16 +225,6 @@ GLOBAL_LIST_EMPTY(station_turfs)
 
 	return FALSE
 
-/turf/CanPass(atom/movable/mover, turf/target)
-	if(!target)
-		return FALSE
-
-	if(istype(mover)) // turf/Enter(...) will perform more advanced checks
-		return !density
-
-	stack_trace("Non movable passed to turf CanPass : [mover]")
-	return FALSE
-
 //There's a lot of QDELETED() calls here if someone can figure out how to optimize this but not runtime when something gets deleted by a Bump/CanPass/Cross call, lemme know or go ahead and fix this mess - kevinz000
 /turf/Enter(atom/movable/mover, atom/oldloc)
 	// Do not call ..()
@@ -243,7 +233,7 @@ GLOBAL_LIST_EMPTY(station_turfs)
 	// Here's hoping it doesn't stay like this for years before we finish conversion to step_
 	var/atom/firstbump
 	var/canPassSelf = CanPass(mover, src)
-	if(canPassSelf || (mover.movement_type & UNSTOPPABLE))
+	if(canPassSelf || (mover.movement_type & PHASING))
 		for(var/i in contents)
 			if(QDELETED(mover))
 				return FALSE		//We were deleted, do not attempt to proceed with movement.
@@ -253,7 +243,7 @@ GLOBAL_LIST_EMPTY(station_turfs)
 			if(!thing.Cross(mover))
 				if(QDELETED(mover))		//Mover deleted from Cross/CanPass, do not proceed.
 					return FALSE
-				if((mover.movement_type & UNSTOPPABLE))
+				if((mover.movement_type & PHASING))
 					mover.Bump(thing)
 					continue
 				else
@@ -265,7 +255,7 @@ GLOBAL_LIST_EMPTY(station_turfs)
 		firstbump = src
 	if(firstbump)
 		mover.Bump(firstbump)
-		return (mover.movement_type & UNSTOPPABLE)
+		return (mover.movement_type & PHASING)
 	return TRUE
 
 /turf/Exit(atom/movable/mover, atom/newloc)
@@ -279,7 +269,7 @@ GLOBAL_LIST_EMPTY(station_turfs)
 		if(!thing.Uncross(mover, newloc))
 			if(thing.flags_1 & ON_BORDER_1)
 				mover.Bump(thing)
-			if(!(mover.movement_type & UNSTOPPABLE))
+			if(!(mover.movement_type & PHASING))
 				return FALSE
 		if(QDELETED(mover))
 			return FALSE		//We were deleted.
@@ -621,11 +611,6 @@ GLOBAL_LIST_EMPTY(station_turfs)
 /turf/proc/Melt()
 	return ScrapeAway(flags = CHANGETURF_INHERIT_AIR)
 
-/turf/bullet_act(obj/item/projectile/P)
-	. = ..()
-	if(. != BULLET_ACT_FORCE_PIERCE)
-		. =  BULLET_ACT_TURF
-
 /turf/proc/get_yelling_resistance(power)
 	. = 0
 	// don't bother checking fulltile, we don't need accuracy