Added offset to stair teleport when using emulator

[SnorreForbregd]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Bug fix

• What is the current behavior? (You can also link to an open issue here)

  396

• What is the new behavior? (if this is a feature change) Added offset to the stair teleport destinations if there is no HMD present

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) No

• Other information: Unity can't do math, 0.6 + 1.8 should not equal 1.4 Also closes #396

[SnorreForbregd]

This uses an outdated version of the FishFeeding scene, and due to merge conflicts it's better to create a new branch based on the new develop. New pull request for new branch is #540