Loco positioning system tutorials/documentation updates

[ArisMorgens]

Our last experiments with the Loco positioning system have brought some issues in the surface. Most of them are related to the documentation and the tutorials.

Here's a list with some improvements:

• The reference set-up [1], [2] should be updated with the anchors mounted in a horizontal state, since this should improve the performance of the system.
• Using more than 8 anchors. The documentation is not enough [3]. We should have clear steps to follow, like:
  • Switching to TDoA3 before the new anchor is added.
  • The new anchor(s) should be already configured with TDoA3.
  • Where to place the new anchor(s) to improve the performance.
  • Also, there has been an issue with the new anchor(s) stop being visible when using TDoA3 after a while.
• Switching modes wirelessly [4]. The cfclient screenshot is old.
• Expected flying behavior [5]. Film a better video showing how the Crazyflie should behave and in what set-up/mode.

[gemenerik]

We should also explain this is because of the radiation pattern (and perhaps draw it) s.t. people understand why