[Rule] Snare Override Movement Bonus (#4381)

* [Rule] Snare Override Movement Bonus

This rule allows snare to override any movement bonuses.

RULE_BOOL(Spells, AllowSnareEffectsOverrideBonus, false, "Enabling will allow snares to override any speed bonuses the entity may have. Default: False")

Default: False

* Rule name

---------

Co-authored-by: Kinglykrab <kinglykrab@gmail.com>

zone/bonuses.cpp

@@ -2438,6 +2438,10 @@ void Mob::ApplySpellsBonuses(uint16 spell_id, uint8 casterlevel, StatBonuses *ne
 			case SE_CastingLevel2:
 			{
 				new_bonus->effective_casting_level += effect_value;
+
+				if (RuleB(Spells, SnareOverridesSpeedBonuses) && effect_value < 0) {
+					new_bonus->movementspeed = effect_value;
+				}
 				break;
 			}