[eve7] use OrbitControl events to check if mouse position changed
[eve7] use OrbitControl events to check if mouse position changed

After mouse buttons is clicked, OrbitControl uses setPointerCapture
function to capture all following mouse move/release events. This
disturb event handling completely. But OrbitControl provides
 start/change/end events which can be used to control if something
 will be changed when button will be released. Used these events to
 implement select/context menu functionality in GlViewerThree.js
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