former know as heroic_entry we now have 3 of those
which let us chose different creature_templates for different
map-types
normal maps will need a bit more support to use correct
spawnmodes
but for battlegrounds it works already good:
they are divided by levelrange:
0-59 == normal spawn -> spiritguides level 60
60-69 == difficulty=1 -> spritiguides level 70
70-79 == difficulty=2 -> spiritguides level 80
80 == difficulty=3 -> spiritguides level 80
this is needed mostly for alterac valley to get
right creature-templates spawned
and with that all creature->SetLevel hacks could
get removed from alterac valley code
