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Fixed memory leak in TranslationManipulatorNode. Each time a quadric was drawn, a new quadric object has been created on the heap but never deleted after. So I replaced the gluNewQuadric() by a member quadric object that gets destroyed in deconstruction.

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Changed snapping feature such that it must be activated by holding the Alt key when dragging selections.

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The transformation manipulator now snaps into the origin position if the cursor's distance is smaller than a given tolerance.
Can be bypassed by holding the Alt key when dragging selections.

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Fix translation files on windows



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