Add icons for delay and addition time controls

diff --git a/pic/addafter.png b/pic/addafter.png
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diff --git a/pic/addbefore.png b/pic/addbefore.png
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diff --git a/pic/pauseafter.png b/pic/pauseafter.png
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diff --git a/pic/pausebefore.png b/pic/pausebefore.png
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