Fix #244 no path2d handles visible
Fixed delete path2d node will crash editor
Use shift for control point in Paht2D editor (to be consistent with Path editor)
Move point in Path2D edtitor now respect snap configure; Press Alt when
moving point to activate view base snapping; Path2D editor inherits from
HBoxContainer now"
Merge pull request #246 from marynate/PR-path2d-editor

Path2D editor bug fix and improvement