Add ability to autoformat tick labels to prevent overlap

[JCGoran]

Due to how matplotlib does its positioning of tick labels, it's possible to have tick labels that overlap.
It would be nice to find a way to generate tick labels that do not overlap by either:

1. using a different format for the labels (assuming they are purely textual)
2. finding a different, but still "nice" position of ticks (using the ticker API), and labeling those instead

Note that the algorithm should take into account the movement of all tick labels (otherwise the plot would not look nice), and provide a scoring function in the end (so it's basically an optimizer).

Provided such an algorithm exists and is general enough, it could even be placed in an external Python module, though I would settle for just an application to this module's plotting requirements.

[JCGoran]

Note: the library adjustText (from this SO answer) does not solve the problem, as it does not take into account the penalty from moving the tick label from the tick position too much.