DCS event engine startup

Event:	S_EVENT_ENGINE_STARTUP		Added with: 1.2.4
Enum ID:	18		Event Locality: None
Description:	Occurs when any aircraft starts its engines. Initiator : The unit that is starting its engines.
Table Format:	The ENGINE STARTUP event table is in the following format. Event = { id = 18, time = Time, initiator = Unit, }
Examples:
Notes:	ID moved from 17 to 18 sometime during patch 2.5.5.
Events:	shot, hit, takeoff, land, crash, ejection, refueling, dead, pilot_dead, base_captured, mission_start, mission_end, took_control, refueling_stop, birth, human_failure, detailed_failure, engine_startup, engine_shutdown, player_enter_unit, player_leave_unit, player_comment, shooting_start, shooting_end, mark_added, mark_change, mark_remove, kill, score, unit_lost, landing_after_ejection, discard_chair_after_ejection, weapon_add, landing_quality_mark, ai_abort_mission, weapon_drop, runway_takeoff, runway_touch,