Core/Config: Change CONFIG_EVENT_ANNOUNCE from int to bool

Also correct the description of BeepAtStart, it works in Windows as well
Core/NPCs: Refactor equipments

- creature_template.equipment_id deleted
- creature_equip_template.entry == creature_template.entry
- id field added to creature_equip_template -> PK(entry, id)
- id field in creature_equip_template starts at 1
- creature.equipment_id references id of creature_equip_template
- creature.equipment_id = 0 means no equipment at all (default 1)
- creature.equipment_id = -1 means pick a random equipment from creature_equip_template
- add equipment info to .npc info command

While table creature_equip_template got bigger in size, this system is easier to mantain and allows creatures to have a random template from a group of equipments