Mob attackedby / check_block refactor, plus some minor cleanup of attack_x procs (#79563)

## About The Pull Request

- Deletes `spec_attacked_by`
- Elements simple/basic mob attack threshold
- There was a skeleton mob that "mimics armor" but didn't use the actual
mimicing armor thing we have, so I changed that.
- Moves `check_shields` down to the living level, renames it to
`check_block`
 - Martial art blocking is now signalized (only CQC uses it anyways) 
- Cleaned up a bit of `attack_x` procs, but not a lot. Should have an
entire PR dedicated to this .... mess.
 - Deprecates `/obj/item/melee`

## Why It's Good For The Game

Second verse, same as the first. 

- Less bad species related procs. 
- Largely brings a lot of code in line, making combat more consistent
across types.
- Makes it a lot easier to add new code relating to blocking or taking
damage.

## Changelog

🆑 Melbert
refactor: Refactored another large chuck of attack code, primarily
involving melee item attacks and non-human mob attacks. Report if you
see anything weird
fix: Pacifists clicking on simple robots or silicons no longer causes
sparks
fix: Blocked thrown batons are now properly... blocked
/🆑

code/modules/mod/modules/modules_antag.dm

@@ -120,13 +120,13 @@
 /obj/item/mod/module/energy_shield/on_suit_activation()
 	mod.AddComponent(/datum/component/shielded, max_charges = max_charges, recharge_start_delay = recharge_start_delay, charge_increment_delay = charge_increment_delay, \
 	charge_recovery = charge_recovery, lose_multiple_charges = lose_multiple_charges, recharge_path = recharge_path, starting_charges = charges, shield_icon_file = shield_icon_file, shield_icon = shield_icon)
-	RegisterSignal(mod.wearer, COMSIG_HUMAN_CHECK_SHIELDS, PROC_REF(shield_reaction))
+	RegisterSignal(mod.wearer, COMSIG_LIVING_CHECK_BLOCK, PROC_REF(shield_reaction))
 
 /obj/item/mod/module/energy_shield/on_suit_deactivation(deleting = FALSE)
 	var/datum/component/shielded/shield = mod.GetComponent(/datum/component/shielded)
 	charges = shield.current_charges
 	qdel(shield)
-	UnregisterSignal(mod.wearer, COMSIG_HUMAN_CHECK_SHIELDS)
+	UnregisterSignal(mod.wearer, COMSIG_LIVING_CHECK_BLOCK)
 
 /obj/item/mod/module/energy_shield/proc/shield_reaction(mob/living/carbon/human/owner,
 	atom/movable/hitby,
@@ -140,7 +140,7 @@
 
 	if(SEND_SIGNAL(mod, COMSIG_ITEM_HIT_REACT, owner, hitby, attack_text, 0, damage, attack_type, damage_type) & COMPONENT_HIT_REACTION_BLOCK)
 		drain_power(use_power_cost)
-		return SHIELD_BLOCK
+		return SUCCESSFUL_BLOCK
 	return NONE
 
 /obj/item/mod/module/energy_shield/wizard

code/modules/mod/modules/modules_security.dm

@@ -67,10 +67,10 @@
 	overlay_state_use = "module_pepper_used"
 
 /obj/item/mod/module/pepper_shoulders/on_suit_activation()
-	RegisterSignal(mod.wearer, COMSIG_HUMAN_CHECK_SHIELDS, PROC_REF(on_check_shields))
+	RegisterSignal(mod.wearer, COMSIG_LIVING_CHECK_BLOCK, PROC_REF(on_check_block))
 
 /obj/item/mod/module/pepper_shoulders/on_suit_deactivation(deleting = FALSE)
-	UnregisterSignal(mod.wearer, COMSIG_HUMAN_CHECK_SHIELDS)
+	UnregisterSignal(mod.wearer, COMSIG_LIVING_CHECK_BLOCK)
 
 /obj/item/mod/module/pepper_shoulders/on_use()
 	. = ..()
@@ -84,7 +84,7 @@
 	smoke.start(log = TRUE)
 	QDEL_NULL(capsaicin_holder) // Reagents have a ref to their holder which has a ref to them. No leaks please.
 
-/obj/item/mod/module/pepper_shoulders/proc/on_check_shields()
+/obj/item/mod/module/pepper_shoulders/proc/on_check_block()
 	SIGNAL_HANDLER
 
 	if(!COOLDOWN_FINISHED(src, cooldown_timer))