Player skills no longer proc equip break on mobs (#7005)

* Fixes #5906.
* Player skills and items that have the ability to break a target's equipment will no longer "break" a non-player's equipment.
* WS_MELTDOWN (Shattering Strike) is able to bypass the non-player check as it does affect all target types.
* Adds a battle config to toggle the behavior.
Thanks to @Tydus1, @Xelliekins, @Atemo, @Daegaladh, and @Lemongrass3110!

src/map/battle.cpp

@@ -10126,6 +10126,7 @@ static const struct _battle_data {
 
 	{ "feature.barter",                     &battle_config.feature_barter,                  1,      0,      1,              },
 	{ "feature.barter_extended",            &battle_config.feature_barter_extended,         1,      0,      1,              },
+	{ "break_mob_equip",                    &battle_config.break_mob_equip,                 0,      0,      1,              },
 
 #include "../custom/battle_config_init.inc"
 };