Implemented the following methods: * SIMCURHAND_TYPE * SIMCURHAND_RADIUS * SIMCURHAND_WEIGHT * SIMCURHAND_DIRECTION Limits: * DIRECTION does not support surfaces, because `BKE_nurb_bpoint_calc_normal` does not work with Nurbs of type `CU_CARDINAL`. This also didn't work prior to this patch, so we wait until surfaces are properly supported in EditMode. * Also DIRECTION should take scaling into consideration. We need our own versions of BKE_nurb_bpoint_calc_normal/bezt. * Threshold default is too large. Not sure if it's better to change the default or scale the threshold in code. Differential Revision: https://developer.blender.org/D3846 Changes from committer (Dalai Felinto): * Moved nurb_bpoint_direction_worldspace_get/bezt to functions. * Comments hinting at the mode (direction) that require scaling to be taken into account - to be addressed by patch creator in a future patch.
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