TTSD-21855

Document manager has two new buttons at the bottom of the window:

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   Delete button for deleting the selected drawings or file documents. Previously, you could only delete selected drawings by selecting Delete in the context menu.
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    Open previous drawing and
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   Open next drawing buttons for opening the previous or next drawing while a drawing is open. Previously, you could only open previous and next drawings by pressing Ctrl+Page Up or Ctrl+Page Down on the keyboard.