Padding settings do not immediately apply

[m4rw3r]

Remaining from the pull request #298.

Amethyst does not trigger changes when changing padding settings, windows need to be resized manually before the new padding is applied or Amethyst needs to be restarted.

The cause of this is both that windows needs to be marked as needing resizes whenever a setting related to padding changes and the leeway for resizes (Amethyst does not consider any window to need a resize if the window padding is smaller than this).

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