Split up and rename var/flags (#17794)

* Split up and rename `var/flags`

* Various fixes

* CL

* Don't rename Phoron Guard phoron preset

---------

Co-authored-by: Cody Brittain <cbrittain10@live.com>

code/modules/power/singularity/act.dm

@@ -34,7 +34,7 @@
 				to_chat(src, "<span class = 'warning'>The [S] pulls \the [hand] from your grip!</span>")
 	apply_damage(current_size * 3, DAMAGE_RADIATION, damage_flags = DAMAGE_FLAG_DISPERSED)
 	if(shoes)
-		if(shoes.item_flags & NOSLIP) return 0
+		if(shoes.item_flags & ITEM_FLAG_NO_SLIP) return 0
 	..()
 
 /obj/singularity_act()

code/modules/power/singularity/containment_field.dm

@@ -8,7 +8,7 @@
 	unacidable = 1
 	use_power = POWER_USE_OFF
 	light_range = 4
-	flags = PROXMOVE
+	movable_flags = MOVABLE_FLAG_PROXMOVE
 	var/obj/machinery/field_generator/FG1 = null
 	var/obj/machinery/field_generator/FG2 = null
 	var/has_shocked = 0 //Used to add a delay between shocks. In some cases this used to crash servers by spawning hundreds of sparks every second.