[OpenLayers-Dev] Pull request for new construction tools (arc intersection, orthogonal lines)

[Mathias Walker]

Hello

I have created new construction tools for arc intersection and orthogonal 
lines.

I would like to contribute these tools to OpenLayers master. Can you please 
review my pull request?

  https://github.com/openlayers/openlayers/pull/783

Best regards
Mathias Walker
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