Description of the enhancement

Plugin infrastructure for Skosmos 3.0 needs to be designed and implemented.

What new functionalities would the enhancement make possible?

Adding plugins to Skosmos 3.0 using vanilla JS or Vue.

Task list

• Update PluginRegister to follow new folder structure
• Load plugin JS files
• Load plugin CSS files
• Make plugin callbacks on page load
• Add new elements to DOM for plugins