Add `$plugin_directory` var which can be used to call the plugin root (e.g. use instead of ` dirname(__FILE__) . "/../templates/"`)
Add get_template() method to fetch template path based on priority stack: child theme, parent theme, custom location, plugin
Add filter to change directory path to templates `mci_footnotes_template_directory`
Add filter to change custom location path `mci_footnotes_custom_template_directory`
Move template processing to discrete method