Ship Map - Create Backend fixtures and API for storing deck SVGs

[alexanderson1993]

Discussed in #161

^{Originally posted by alexanderson1993 January 3, 2022}

SVG layers

Each deck will first be defined with an SVG file that shows a graphical layout of that deck, with one SVG for each deck. Any images, lines, or diagrams can be used in these SVGs, but there will be guidelines for making sure the deck diagrams have a consistent appearance. SVGs are preferred since you can infinitely scale them without losing resolution, but it could be configured to work with transparent PNGs too.

As far as scale is concerned, we'll treat one SVG point as one meter. The expectation is that the deck SVGs will be able to layer on top of each other so they have everything lined up properly between decks.

In the future, there can be an in-app SVG editor, but for 1.0, we'll expect ship map SVGs to be created by hand or using an image editor like Adobe Illustrator.
So, decks will consist of:

• A name
• An order
• An SVG image

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Editing the Ship Map

Creating and editing the ship map is a simple process:

• First, create and name a deck and upload an image for it. The image is stored in the file system with the plugin, not in the .yml file for the ship template.

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