Customizable nail clamp - also for multiple cables

This is a remix of thing https://www.thingiverse.com/thing:4816588

In addition to all the features of thing https://www.thingiverse.com/thing:4816588, now the following new features have been added:
* Multiple cables are possible.
* Two nail bushings are possible - one on either side
* cutoffs on top and bottom possible

Note: You may use the Thingiverse or OpenScad Customizer to create your own

*The attached json file contains some sample settings for OpenScad*
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The updated Version 4 allows finer adjustment of the sizes of most parameters. In Version 3 some parameterw were only adjustable in steps of 1mm