This patch adds an updated version of the curve to points that
supports fields. Only the position and radius attributes are transferred
by default now, which should improve performance. The other outputs
like tangent and rotation are outputted with anonymous attributes.

I took the opportunity to change a few other small things about the node:

• Name geometry sockets "Curve" and "Points" like other nodes.
• Remove the radius multiple of 0.1. In retrospect I don't think this is worth the confusion.

Thanks to @Johnny Matthews (guitargeek) for an initial version of this patch!