KSA Multiplayer v0.4.3 Beta 1

This beta fixes delayed and uneven nearby vessel movement discovered during live two-player testing. Position interpolation now uses real elapsed time, movement queues retain at most four snapshots and coalesce to the newest state, nearby updates run at 15 Hz, and automatic company time jumps have been removed. Both players must install v0.4.3 and restart KSA before reconnecting.