DCS event player enter unit

Event:	S_EVENT_PLAYER_ENTER_UNIT		Added with: 1.2.4
Enum ID:	20
Description:	Occurs when any player assumes direct control of a unit. Initiator : The unit that is being taken control of.
Table Format:	The PLAYER ENTER UNIT event table is in the following format. Event = { id = 20, time = Time, initiator = Unit, }
Examples:
Notes:	As of DCS 1.5 this event should now correctly fire for any player/clients entering a Combined Arms unit. ID moved from 19 to 20 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