[REFACTOR] Consolidates SLOT_FLAG and SLOT_HUD into one ITEM_SLOT flag (#26743)

* IT WORKS UP UNTIL THIS POINT

* Consolidates SLOT_FLAG and SLOT_HUD into one

* Remove cover_both_ears

* SLOT_HUD to ITEM_SLOT

* Remove clothing_trait changes for the time being

* Remove accidental copy-paste

* Re-add no-slip var

* More failure to copy-paste correctly

* Leftover flag

* Combine left and right slot flags where possible

* UNGOOF MY DEFINES, PHAND IS NOT A THING

* Minor spacing changes

* Some more fixes from merge

* Seperates ITEM SLOT AMOUNT into two defines

* ON SECOND THOUGHT LETS NOT DO THAT.

* Addresses Contra's review

* Thank you GREP

* Rename ITEM_SLOT_FEET to ITEM_SLOT_SHOES

* Added a comment to the bitmasks in clothing defines

* Rename ITEM_SLOT_TIE to ITEM_SLOT_ACCESSORY

* These are for a seperate PR.

* Magboot fixes

* Requested changes

* Re-add accidental removal

* Wrong flags

* Update code/__DEFINES/clothing_defines.dm

Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>
Signed-off-by: Chap <erwin@lombok.demon.nl>

* Requested changes

* Merge fixes

* Fix double headset

* Fixes multiple accessories

---------

Signed-off-by: Chap <erwin@lombok.demon.nl>
Co-authored-by: Adrer <adrermail@gmail.com>
Co-authored-by: Contrabang <91113370+Contrabang@users.noreply.github.com>

code/modules/paperwork/clipboard.dm

@@ -11,7 +11,7 @@
 	throw_speed = 3
 	var/obj/item/pen/containedpen
 	var/obj/item/toppaper
-	slot_flags = SLOT_FLAG_BELT
+	slot_flags = ITEM_SLOT_BELT
 	resistance_flags = FLAMMABLE
 
 /obj/item/clipboard/New()

code/modules/paperwork/paper.dm

@@ -14,7 +14,7 @@
 	throw_range = 1
 	throw_speed = 1
 	pressure_resistance = 0
-	slot_flags = SLOT_FLAG_HEAD
+	slot_flags = ITEM_SLOT_HEAD
 	body_parts_covered = HEAD
 	resistance_flags = FLAMMABLE
 	max_integrity = 50

code/modules/paperwork/pen.dm

@@ -15,7 +15,7 @@
 	icon = 'icons/obj/bureaucracy.dmi'
 	icon_state = "pen"
 	item_state = "pen"
-	slot_flags = SLOT_FLAG_BELT | SLOT_FLAG_EARS
+	slot_flags = ITEM_SLOT_BELT | ITEM_SLOT_BOTH_EARS
 	throwforce = 0
 	w_class = WEIGHT_CLASS_TINY
 	throw_speed = 3

code/modules/paperwork/photography.dm

@@ -172,7 +172,7 @@
 	icon_state = "camera"
 	item_state = "electropack"
 	w_class = WEIGHT_CLASS_SMALL
-	slot_flags = SLOT_FLAG_BELT
+	slot_flags = ITEM_SLOT_BELT
 	var/list/matter = list("metal" = 2000)
 	var/pictures_max = 10
 	// cameras historically were varedited to start with 30 shots despite
@@ -633,7 +633,7 @@ GLOBAL_LIST_INIT(SpookyGhosts, list("ghost","shade","shade2","ghost-narsie","hor
 /obj/item/videocam/advanced
 	name = "advanced video camera"
 	desc = "This video camera allows you to send live feeds even when attached to a belt."
-	slot_flags = SLOT_FLAG_BELT
+	slot_flags = ITEM_SLOT_BELT
 
 #undef CAMERA_STATE_COOLDOWN