[API] Apply spells with custom buff durations and adjust existing spell buff durations.

[KayenEQ]

Added quest function that allow you to alter existing buffs durations and a function that allows you to apply new buffs with custom durations. As well, new functions to obtain buff information, such as duration, from spell id or buff slot.

$mob->SetBuffDuration(spell_id, duration)
This function will adjust an existing buff with the defined spell id to a new buff duration.
Setting spell_id to -1 will adjust ALL buffs to that duration
Setting duration to 0, will adjust the buff to its normal max duration.
Setting duration to -1, will set the buff to be permanent duration.

$mob->ApplySpellBuff(spell_id, duration)
This function will add a new spell buff to the mob with a custom duration.
Setting duration to 0 or not defined, will set the buff to its normal max duration.
Setting duration to -1, will set the buff to be permanent duration.

GetBuffStatValueBySpell(spell_id, stat_identifier)
GetBuffStatValueBySlot(slot, stat_identifier)

Obtain information about a buff from our internal buff struct, such as duration ("ticsremaining'), can be obtained by finding the buff by a spell id, or by finding the buff by buff slot (0=1st slot).

	 "caster_level"
	 "spell_id"
	 "caster_id"
	"ticsremaining" // duration
	 "counters" //cure counters
	"hit_number" //hit counter, that little box on spell buffs that tics down
	"melee_rune"
	"magic_rune"
	"dot_rune"
	"caston_x"
	"caston_y"
	"caston_z"
	"instrument_mod" //bard and base effects modifier
	"persistant_buff" // buff exists after zoning
	"client" //is on a client
	 "extra_di_chance"
	 "root_break_chance"
	 "virus_spread_time"

[Kinglykrab]

Can remove the tolower loops.