Separates actions.dmi into multiple files (#29587)

actions.dmi is way too cluttered and messy, and with inhands getting the axe I decided to fix this, too. I separated the major categories of actions into their own files, like antagonist-specific actions and spells. A full list of categories is found here:

    actions_AI.dmi contains AI-specific actions;
    actions_clockcult.dmi contains clockcult-specific actions, and scripture quickbind icons;
    actions_cult.dmi contains cult-specific actions as well as sintouch;
    actions_flightsuit.dmi contains flightsuit and flightpack actions;
    actions_items.dmi contains minor item-specific actions such as the hierophant club and jetboots;
    actions_mecha.dmi contains actions related to mechs;
    actions_minor_antag.dmi contains antag-related actions with no other spot, like devils/abductors;
    actions_revenant.dmi contains revenant ability icons;
    actions_silicon.dmi contains minor silicon and console icons, like pAI and xenobiology consoles;
    actions_slime.dmi contains slime actions;
    actions_spells.dmi contains icons for all spells;
    actions_xeno.dmi contains icons for all xeno actions; and
    backgrounds.dmi contains backgrounds for the action buttons.

code/modules/projectiles/gun.dm

@@ -446,6 +446,7 @@
 /datum/action/toggle_scope_zoom
 	name = "Toggle Scope"
 	check_flags = AB_CHECK_CONSCIOUS|AB_CHECK_RESTRAINED|AB_CHECK_STUN|AB_CHECK_LYING
+	icon_icon = 'icons/mob/actions/actions_items.dmi'
 	button_icon_state = "sniper_zoom"
 	var/obj/item/weapon/gun/gun = null
 

code/modules/projectiles/guns/beam_rifle.dm

@@ -764,10 +764,12 @@
 
 /datum/action/item_action/zoom_speed_action
 	name = "Toggle Zooming Speed"
+	icon_icon = 'icons/mob/actions/actions_spells.dmi'
 	button_icon_state = "projectile"
 	background_icon_state = "bg_tech"
 
 /datum/action/item_action/zoom_lock_action
 	name = "Switch Zoom Mode"
+	icon_icon = 'icons/mob/actions/actions_items.dmi'
 	button_icon_state = "zoom_mode"
 	background_icon_state = "bg_tech"