Replace all secondary flags with bitflags stored in the flags_2 var

code/game/mecha/mecha.dm

@@ -23,7 +23,7 @@
 	layer = BELOW_MOB_LAYER//icon draw layer
 	infra_luminosity = 15 //byond implementation is bugged.
 	force = 5
-	flags = HEAR
+	flags_1 = HEAR_1
 	var/can_move = 1
 	var/mob/living/carbon/occupant = null
 	var/step_in = 10 //make a step in step_in/10 sec.

code/game/mecha/mecha_parts.dm

@@ -7,7 +7,7 @@
 	icon = 'icons/mecha/mech_construct.dmi'
 	icon_state = "blank"
 	w_class = WEIGHT_CLASS_GIGANTIC
-	flags = CONDUCT
+	flags_1 = CONDUCT_1
 	origin_tech = "programming=2;materials=2;engineering=2"
 
 /obj/item/mecha_parts/chassis
@@ -313,7 +313,7 @@
 	item_state = "electronic"
 	lefthand_file = 'icons/mob/inhands/misc/devices_lefthand.dmi'
 	righthand_file = 'icons/mob/inhands/misc/devices_righthand.dmi'
-	flags = CONDUCT
+	flags_1 = CONDUCT_1
 	force = 5
 	w_class = WEIGHT_CLASS_SMALL
 	throwforce = 0