Snap star (customisable)

## Snap Star

This is a customisable snap version of Multipoint 3D Star.

## API

```
// Include API
use

// rendering precision
$fn=100;

// Create star with default sizes
star = newStar();

// Show the core
snapStarCore( star );

// Show the bed full of 26 branches (18 square + 8 triangle)
snapStarAllBranches(star);

// Show the special branch for stand on a tree
snapStarTreeStandBranch(star);

```

Default parameters defines a star with 20mm side branches and 80mm length branches.
You can change this when building the star object. undef means "use default value":

```
// width: cell width (ie square border length)
// long: long branches (square branches) length
// short: short branches (triangle branches) length
// thickness: branch wall thickness
// form: branch form factor ( 0: Flat, 2: Rounded, 3:Straight, 4:Sharp etc... )
// trunk_d: tree trunk diameter if you need tree stand
// trunk_l: tree trunk stand length if you n