Better Curve drawing behavoir

[defini-tiv]

Is your feature request related to a problem? Please describe. Cubic bezier curve is wired to use because:

• You don't see a preview of the curve before determining the end point
• The behavior for first and second tangent are different (first drag, second two clicks)
• The curve doesn't end where you position the end point initially

Describe the solution you'd like Implementing the Inkscape behavior:

• First click start point of curve, hold and drag for tangent
• Second click for end point, hold and drag for tangent.
• Live preview of curve after first click

This behavior would also make the quadratic curve option obsolete because if you only hold and drag only one time, you get a quadratic curve.