[m2446] Immediately remove corpses when ForcedDespawn is used

Based on cmangos/mangos-classic@8bb5c5f376

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>
[m2447] Implement some custom use for Effect Activate Object spells.

This will fix the summoning events for the Wind Stones.

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>