Move files into nicer subdirectories

docs/TODO.md

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+# TODOs and Remarks
+
+## Now
+
+* ghcup init?
+* merge two download files
+* fetch/unpack functionality
+* installing multiple versions of the same
+* post-install
+
+* proper test suite
+
+* !! update of 0.1.5 must go in ghcup-0.0.1.json !!
+
+* try to run exe before upgrade (backup to ~/.ghcup/bin/ghcup.old)
+* stdout flushing?
+* resume support (for make-install only)
+
+## Maybe
+
+* version ranges in json
+* sign the JSON? (Or check gpg keys?)
+* testing (especially distro detection -> unit tests)
+
+## Later
+
+* add support for RC/alpha/HEAD versions
+
+## Cleanups
+
+* avoid alternative for IO
+* use plucky or oops instead of Excepts
+
+## Questions
+
+* move out GHCup.Version module, bc it's not library-ish?
+* mirror support
+* interactive handling when distro doesn't exist and we know the tarball is incompatible?
+* ghcup-with wrapper to execute a command with a given ghc in PATH?