Sentry Aim Retention - v1.1.1

• With none of your sentries deployed the mod waits instead of reading the targeting registry every frame: on the ship it checks for a mission every 60th frame, in a mission for a new sentry every 30th. Measured in game: 0.011 to 0.003 ms per frame on the ship, 0.010 to 0.003-0.004 in missions and 0.016 to 0.006 under heavy load.