ADD: (Backported from Standard) jump point search: makes ship route finding much faster.
FIX: Infinite loop in some cases.
VERSION: Increment to 11.24
FIX: Occasionally, a train would not fully unreserve its route at a terminus station, causing blockages.
Merge branch '11.x' into 12.x

Conflicts:
	simversion.h
Merge branch '12.x' into devel-new