Add an option to not display "ID" for the customer, company and items in the PDF

[khalyomede]

Description

I want to be able to control wether to display the ID of the company, customer and items or not.

Expected behavior

Customer

If the "id" field is not present, do not display it in the invoice

Company

If the configuration has not been publish, or the configuration do not contain the "id" key, do not display it in the invoice

Items

If the "id" field is not present, do not display it in the items table

Actual behavior

The id of the customer is displayed empty. The id of the company is "1234567890" by default. The id column on the items table is displayed.