Start collecting refactoring ideas.

REFACTOR.md

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+# Refactoring ideas
+
+## Short term
+
+* Integrate typescript in the build and start migrating the server code.
+
+## Mid term
+
+* Port complete server to typescript.
+* Port the server code to promises and `async` / `await`.
+* Use ES6 style imports instead of `require`.
+* Store node data in database and export it for gateways.
+* Write tests (especially testing quirky node data).
+
+## Long term
+
+* Rewrite the admin interface (used lib is unmaintained).
+* Rewrite the client in typescript (+ vue?).
+* Replace the grunt build system.
+* Decentralize node data.