AGX-2606 addon - Colobot: Gold Edition

Every level in this campaign with the exception of level 4 has a modified track from "Symphonies Of The Planets" by NASA Voyager Recordings. Level 4 has "Castle Gate" by Toxeen as its soundtrack. If none of this is okay, I will remove it.

Tested as working in version 0.2.1, let me know if I missed anything.

*****************INSTALLATION*************************

Unzip into "Colobot Gold/data/levels/custom" , so that it looks like "Colobot Gold/data/levels/custom/[planet name]/level001, level002,..." . Create the folder "custom" if it doesn't exist already.

*****************CHANGELOG*************************

03/09/2023 - Removed the key from the resource file on level 4. Changed the SatCom instructions and solution on level 5.