[Request] Don't enlarge small images

[Former user]

Hey, thanks for the great app.

At now we have option "Fit to window if large", but it affects only, when whole image is fitting.

How about add separate option "Don't enlarge small images", that affects to: - "Fit to window" - "Fit height to window" - "Fit width to window"

Thanks.

[Ito Mitsuhiro]

表示スケールとは別に「拡大の許可」「縮小の許可」設定を追加。これに伴い「大きい(小さい)場合はウィンドウサイズに合わせる」設定を廃止 (fixed #638)

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