New Rockplanet Ruin: The Abandoned Shipping Dock (Redone Layout) (#2393)

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## About The Pull Request
SDMM:
![StrongDMM-2024-04-21 04 36
46](https://github.com/shiptest-ss13/Shiptest/assets/95449138/79f98fe2-47ab-4c5a-a063-c5ef42902c15)
![StrongDMM-2024-04-21 04 36
49](https://github.com/shiptest-ss13/Shiptest/assets/95449138/fec77936-0dd1-485f-8c5e-fa68b9ec5b91)


Ingame:

![image](https://github.com/shiptest-ss13/Shiptest/assets/95449138/f217f1cf-70da-4c3b-b3a9-8914989e7ea6)


Adds a new ruin for rockplanet. Its an abandoned shipping dock
previously used by traders and smugglers in the sector. It has since
fallen into disrepair, forgotten by its owners. Malicious scavengers or
other groups have since filled the place with devious traps, hoping to
catch their competition (You) off guard.
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## Why It's Good For The Game
more ruins that arent free rnd or gamer loot are good
please map more ruins
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## Changelog

:cl:
add: rockplanet_shippingdock.dmm and associated code
/:cl:

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Co-authored-by: spockye <[email protected]>