Split plugins into example plugins and something like "core" plugins

[Masterchef365]

Right now we have certain types of plugins which are just for demonstration purposes (such as the ecs example), and others which are useful outside of a teaching or demonstration context (such as the camera plugin). I think it would be wise to make a split.

One way to organize the plugins might be like so:

plugins/

• examples/ (For teaching)
• utilities/ (Useful, like camera plugin)
• demos/ (Interactive fun stuff)

On the other hand, it complicates the directory structure of the project. It might also make sense to keep these plugins in a separate repository, or even in their own individual repositories. Feedback would be appreciated!