A few additions to springyui.js#108

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jonnybradley wants to merge 3 commits intodhotson:masterfrom

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Commits on Apr 14, 2020

Add hooks for mousedown, mousemove events and add the same params to doubleclick (namely selected/nearest, the event and the node's screen position)
jonnybradley
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Expose nodeFont, edgeFont and maxSpeed to springyui.js
jonnybradley
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Better checking of selected in dblclick
jonnybradley
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