DCS event mission start

Event:	S_EVENT_MISSION_START		Added with: 1.2.4
Enum ID:	11		Event Locality: None
Description:	Occurs when a mission starts
Table Format:	The shot event table is in the following format. Event = { id = 1, time = Time, }
Examples:
Notes:
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,