Templating / snippets feature

[JasonLautzenheiser]

Allow the saving / loading of a group of entities. These could be inserted (perhaps multiple times) into an existing map as a whole and then manipulated individually. #55

Could encourage the sharing of templates among users (perhaps setting up some sort of template library)

Another usage of templates would be the saving of properties on entities and not necessarily the entities themselves. For example, you could set up your regions and their colors one time, save as a template and then load them into your current map. (Perhaps this is a separate feature, but it can start off here)

[JasonLautzenheiser]

Save a group of highlighted elements off to a template file that can be imported into other maps. Need to work on details here.

[github-actions]

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