[ADD] Adds options to customize the cell name in the tray location an…

[damendieta]

Adds the following fields to customize the name of the cell:

• x_prefix
• y_prefix
• xy_padding
• y_first

The name is computed with a new function get_subloc_name to allow customization.

The posz field is passed to the cells and if changed all cells get updated too.

[guewen]

Hi @damendieta,

Thanks!
I like your idea of being able to customize the generated name.
I think we can do something more powerful and with less code by using a single formatted field with replacement strings (so you can use whatever order you want, add custom parts, ...), I pushed a commit to my branch: OCA@62660be

I extracted the part for the z position from your PR (since the rest of the commit is redundant with my commit 62660be) and authored the commit to you (OCA@700469b).

I close the PR as I pushed the changes directly to my branch, thanks again!