Add prev/next navigation support for text, images, video. Fix undo/redo toolbox issue.#489

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cubiclesoft:ct-issue-487

Commits on Sep 2, 2017

Added touch drag-and-drop support to toolbox.
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Commits on Oct 13, 2017

Merge remote-tracking branch 'upstream/master'
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Commits on Mar 20, 2018

Merge remote-tracking branch 'upstream/master'
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Added prev/next navigation support for text, images, video. Also fixes undo/redo issues.
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Commits on Mar 24, 2018

Fixed multi-region navigation issue.
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