* New CreatureAI::SummonedCreatureJustDie called for owner at temporary summoned creature die.
* New EVENT_T_SUMMONED_JUST_DIE (25) for proccess CreatureAI::SummonedCreatureJustDie event
* New EVENT_T_SUMMONED_JUST_DESPAWN (26) for proccess CreatureAI::SummonedCreatureJustDespawn event
* Some code cleanups.
* Rename creature template `heroic_entry` => `difficulty_entry_1`
Possible need add 2 more fields for 2-3
* Use 2 more EventAI EFLAG_* flags for 2-3 difficulty support, update checks.
* Update area trigger code.
Note: support for specialized creature version for difficulties 2-3 not added yet
and will be used same as difficulty 1 mode.
TODO: Rename area triggers heroickey/etc fields ?
Action set min. health value that can be set for creature in result damage apply.
It can be used in duel like events with creatures to prevent killing creature and other
cases when creature must avoid damage at some health level while it used.
Including:
* Fixed check for EVENT_T_SPELLHIT school field. Add check at loading. Note: this event expect before and now schol _mask_ in param2.
* In EVENT_T_RECEIVE_EMOTE use original player condition check code instead copy of related code.
* Also send to process function reference to strucutre instead large amount fields.
* Specially note that fixed check for first arg of action type 27 that before wrongly test as quest id,
when by using code expected creature id. Possible some used data wrongly can be quest ids....
