[Plugin] Trailer for Satsuma 1.5

* Just update to new MSCLoader version (0.4.3)

- Fixed a bug when you saved the game and when you continued many errors occurred and a sudden drop of frames per second

"Thanks Zamp for help me with that bug"

- Fixed many bugs.
- Add a hitch to Hayosiko (Van).

- Add a stand to keep the trailer raised.
- The support does trailer more stable to pull with hands.

- Fixed an issue where it was not possible to get the trailer and not hook into satsuma.
- Fixed a problem where it was not possible to engage the trailer after disengaging
- Fixed other minor issues