Multiple schemas

[albingroen]

Changes

• Change the application to work around the concept of working with multiple schemas. This means that the root route will list multiple schemas, and allow you to create new ones. Then, each schema acts like the root route previously, which allowed you to work with the models.
• To make the transition to this paradigm a lot easier, I've added a feature that'll create a schema called "New Schema" for the user, which copies over the models and enums they've been working on.
• Remove the graph feature modal

Closes #10

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