Mirror 66967 & 67411 (#14279)

* Implements a Demolition Modifier variable to items, affects damage vs structures and robots. (#66967)

Adds a modifier variable which can be used to increase or decrease a given items damage to structures, machinery, vehicles, and robots (including cyborgs, simple-bots, and anything else with the MOB_ROBOTIC biotype)

* Fixes attacks on mech equipment ignoring armor / melee damage, also fixes mech equipment not being disabled at 0% health, also also unit tests mech armor (#67411)

Co-authored-by: itseasytosee <55666666+itseasytosee@users.noreply.github.com>
Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>

code/game/objects/items/tools/crowbar.dm

@@ -10,6 +10,7 @@
 	slot_flags = ITEM_SLOT_BELT
 	force = 5
 	throwforce = 7
+	demolition_mod = 1.25
 	w_class = WEIGHT_CLASS_SMALL
 	custom_materials = list(/datum/material/iron=50)
 	drop_sound = 'sound/items/handling/crowbar_drop.ogg'

code/game/objects/items/tools/screwdriver.dm

@@ -11,6 +11,7 @@
 	flags_1 = CONDUCT_1 | IS_PLAYER_COLORABLE_1
 	slot_flags = ITEM_SLOT_BELT
 	force = 5
+	demolition_mod = 0.5
 	w_class = WEIGHT_CLASS_TINY
 	throwforce = 5
 	throw_speed = 3

code/game/objects/items/tools/wrench.dm

@@ -10,6 +10,7 @@
 	slot_flags = ITEM_SLOT_BELT
 	force = 5
 	throwforce = 7
+	demolition_mod = 1.25
 	w_class = WEIGHT_CLASS_SMALL
 	usesound = 'sound/items/ratchet.ogg'
 	custom_materials = list(/datum/material/iron=150)