* Use haskell-lsp’s builtin VFS in "damlc ide"
haskell-lsp has a builtin VFS that it updates automatically on the
corresponding requests. This PR removes our own VFS implementation and
uses that builtin VFS in "damlc ide". To allow the use of functions
like setBufferModified (we use that heavily in daml-ghc-shake-test-ci)
without having to spawn an LSP server, we also add a fallback where we
spin up our own LSP implementation.
* Demo program for haskell-ide-core as a library
* Fix all warnings in the Demo file
* Build the IDE demo
* Give a better error message than undefined
* HLint
* Fix copyright header
* Sort the dependencies
* Improve the comment
* Bazel formatting
* Disable building on Windows until ghc-paths is fixed
* Bazel formatting
* Specify the main function
