Improvements for Simple-Navigate

[Flottegurke]

There are 2 additional function that would greatly improve the results of the Simple-Navigate mode:

• 1. Add separate scanning buffer.
  Since the optimal distance is getting calculated with the same buffer the drive thread uses, this causes the bot to often stop earlier then intended, because after the new heading was calculated, the bot still moves a bit in the old direction, leading to the new heading to be suboptimal. A cheap workaround for this should be, to add a Separate scanning buffer, which is set slightly higher then the driving buffer.

• 2. Add option to wait with heading recalculation until the bot reached an obstacle.
  This improoves the bots ability to navigate more complex mazes, but leads to an slower solving time in easier mazes.