Add hook in ticket parameter to add and change new variables

[Axel35000-tech]

Checklist before requesting a review

Please delete options that are not relevant.

• I have read the CONTRIBUTING document.
• I have performed a self-review of my code.

Description

• Add hook to add new variables in answers template (followup, solutions, etc.)

[cedric-anne]

Hi,

Thanks for the contribution.

1. This should be made in a generic way.

For instance, to get additionnal parameters, you can do something like that in the TemplateDocumentation class, to make the plugin being able to define additional parameters for all the supported object types.

$additionnal_parameters = [];
foreach ($PLUGIN_HOOKS[Hooks::SHOW_ITEM_RESP_PARAM] as $plugin => $hook_callable) {
    $plugin_parameters = Plugin::doOneHook($plugin, Hooks::SHOW_ITEM_RESP_PARAM, $parameters_class::getDefaultNodeName());
    if (is_array($plugin_parameters)) {
        array_push($additionnal_parameters, ...$plugin_parameters);
    }
}

2. The naming is not correct. These hooks will be used to add additionnal user templates nodes, so something like get_content_template_parameter and get_content_template_value would be more appropriate.