Feature curve creation#1802

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ghost wants to merge 8 commits intoStephan-S:beta-testingfrom

Exceptionfault:feature-curve-creation

Commits on Jan 16, 2021

Initial Version with auto curve generation. Not yet production ready.
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Much better smoothing and constant results due to normalized tangents.
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Made the roundness dependent based on the angle of the curve.
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Allow for curve preview and edit roundness before creation.
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Fixed straight line behaviour and reduced points a bit.
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Made smooth connections an experimental feature which can be enabled/disabled ingame.
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Changed height calculation by using raycast to the ground.
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Made curvature controllable via mousewheel.
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