this function allows your plugin to set itself up, include any necessary API's, declare or hook events, etc.
Alternatively, your can plugin can hook the EVENT_PLUGIN_INIT event that will be called after all plugins have be initialized.
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This callback is executed after the normal uninstallation process, and should
handle such operations as reverting database schemas, removing unnecessary data, etc. This callback should be used only if Mantis would break when this plugin is uninstalled without any other actions taken, as users may not want to lose data, or be able to re-install the plugin later.
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This callback is executed after the normal schema upgrade process has executed.
This gives your plugin the chance to convert or normalize data after an upgrade
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