Craft doesn't sink properly when they hit worldborder

[goodroach]

Describe the bug
When a craft sinks and crashes into a worldborder, (can be replicated by an airskiff scuttled while cruising forward), it constantly gets blocked and doesn't release.

To Reproduce
Steps to reproduce the behavior:

1. Make an airskiff
2. Cruise forward
3. Scuttle the airskiff when its about to collide with the worldborder

Expected behavior
The craft should release when it hits the world border when sinking.

Screenshots
If applicable, add screenshots to help explain your problem.

Versions:

• Movecraft: 8
• Java 16
• Minecraft 1.16.5

[TylerS1066]

This probably will be fixed along with #480 when we fix all the cruise problems with sinking crafts.

The solution to this specifically will be to change the direction to straight down instead of forwards and down.

[TylerS1066]

After merging #480 and the sinking changes, I think this may be a bigger problem than initially suspected. The core problem is that Movecraft doesn't appear to abide by the worldborder at all, and as such this may require some large changes.