title: Odoo - Why odoo store data of TransientModel like res.config.settings into ir.config_parameter?
body: <p><code>res.config.settings</code> model is TransientModel and TransientModel are designed to be stored temporary data, After periodically time it will remove data from the database. For saving those settings we have to implement <code>set_param</code> and <code>get_param</code> method of <code>ir.config_parameter</code>.</p>
  
  <p>So, Here I want to know why odoo used <code>ir.config_parameter</code> to store those setting values. Why we can't make <code>res.config.settings</code> as <code>Model</code> instead of <code>TransientModel</code> and store data into that model.</p>