Hotfix patch v9.15

* The fight & flight update is now out on Linux too!
* Animals with bird legs no longer get stuck in the floor
* Random rotations for animals after placing manually
* Random rotations for animals after visiting the editors
* Random rotations for animals after time jumps
* Notification: you unlocked the sandbox
* Improved description mountain level
* The species example organism is now always the last one you build, taking away a lot of confusion!