Carefree Awning Hook - no supports

Based on a model by Jon Bilbao for a Flamma awning.

Jon helpfully provided OpenSCAD code which I used to create a version for the Carefree awning.

Have added some strength to the main body, made the hole for the hook larger, moved the hole to reduce stress on end of hook and increased the size of the cylinder to better suit my Carefree awning.