User can style a node with an .svg

[afomi]

Story

As a User
I want to represent a Node with an .svg
So I can customize my map
And identify the node in a visually meaningful way

Acceptance Criteria

Given a Node exists on a Map
When I click on the Node
And I click "Set SVG Style"
And I select a valid .svg file to upload
And I click "Select" or "Upload" - in the browser
Then I see the node updated with the .svg shape