[z2114] Add EVENT_T_TIMER to EventAI. This is a generic timer that ticks out of combat and in combat

Signed-off-by: Schmoozerd <schmoozerd@cmangos>

(based on commit bae9646)

Signed-off-by: Xfurry <xfurry@scriptdev2.com>

(based on commit [s1738] - 1796f4a)