Purpose ======= This commit is used to merge 2 models into 1: `slide.slide.resource` and `slide.slide.link` Specifications ============== These models are merged in order to create a unique table for the *Additional Resources* of a Content. In order to do that, we merged the models into `slide.slide.resource` that will contain either a link or a file. task-2597345 See odoo/enterprise#20480 See odoo/upgrade#2784 Part-of: odoo/odoo#75646