Updated Linux Support

There was an issue with SailSim on Linux which is fixed now. I am trying to make CrossPlay work but cant promise anything as it turned out to be more complex than i thought. 

Enjoy the latest version natively on Linux and as always if you have any questions don't' hesitate to ask. 

Don't forget to pass "chmod +x SailSim.sh" and the same for the SailSim-Shipping executable before running.