User configurable delay when spinning fort

[Quantra]

Short Description:

_Needs example configs updating & docs_

This PR allows the user to set min and max time spent spinning a pokestop and replaces the previous 2 second pause.

      {
        "type": "SpinFort"
        "config": {
          "spin_wait_min": 2,
          "spin_wait_max": 3
        }
      }

With #3872 and #4048 everything should have a user configurable delay in it's own task config.

[mention-bot]

@Quantra, thanks for your PR! By analyzing the annotation information on this pull request, we identified @douglascamata, @sinap and @TheSavior to be potential reviewers

[MZorzy]

Why not have a special humanpauseconfig.json with all pause and let config.json small ?

[Quantra]

@MZorzy I think all task related config should be set in the task's config. I don't want to look somewhere else in the config or another file.

[BriceSD]

@Quantra You made a PR in master, open an other one in dev please