Add a "Add from template" page for the semantic model (#2105)

This adds a button and new sub page to the semantic model.
On that sub-page the user can select from a few different basic templates for
semantic locations which can then be automatically created and added to the model.

There are a few options for customization:
1) The user can select a custom prefix that will be applied to all the items to fit or establish a desired naming scheme.
2) The user can optionally deselect extra pieces of the model that are not appropriate to their needs.

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Also-by: Florian Hotze <florianh_dev@icloud.com>
Signed-off-by: Justin Georgi <justin.georgi@gmail.com>