- Move makefile to core/
- Migrate project solution to .slnx format
- Move loader/ to packages/hub/
- Move plugins/ to packages/preload/
- Add root package.json
- Add an empty app/ for later app hub impl
- Add an empty packages/types/ for later shared types

- Add rcp.graph(), rcp.dependencies(name), rcp.dependents(name) and
rcp.names() backed by LCUX's /graph.json, lazily fetched and cached as a
shared Promise.

- Lets plugin authors enumerate every RCP plugin name before any announce
fires — necessary under the push-style RCP contract for subscribing
ahead of time.

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