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8801: feat: Allow viewing the crate graph in a webview r=jonas-schievink a=jonas-schievink This uses `dot` to render the crate graph as an SVD file, and displays it in a VS Code panel. For simple crate graphs, it works quite well: ![screenshot-2021-05-11-16:19:32](https://user-images.githubusercontent.com/1786438/117831361-c4a48980-b274-11eb-9276-240cdf6919aa.png) Unfortunately, on rust-analyzer itself (and most medium-sized dependency graphs), `dot` runs for around a minute and then produces this mess: ![screenshot-2021-05-11-16:41:37](https://user-images.githubusercontent.com/1786438/117834831-c754ae00-b277-11eb-850b-138495dbeba8.png) Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>