Merge branch '74-add-settings-game-board-cell-models' into 'master'

Resolve "Add "settings / game / board / cell" models"

Closes #74

See merge request !73

icons/level_easy.svg

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icons/level_hard.svg

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icons/level_medium.svg

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icons/level_nightmare.svg

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icons/size_2x2.svg

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icons/size_3x2.svg

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icons/size_3x3.svg

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icons/size_4x4.svg

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