Mixed encoding projects can cause the LSP server to loop-restart

[nickbattle]

If you have a project with a mixture of UTF-8 and UTF-16LE source files, the server is told to shutdown and restart in a loop?

Strangely, the LSP message exchanges look reasonable - there isn't an exception thrown, for example, just error messages from the parser when the UTF-16LE file is parsed, as expected.

The Client does pop up a warning about the non-UTF-8 file, but we should probably do better that allowing the restart loop?

[nickbattle]

Actually, the simplest case of the failure is when you have a project with a single UTF16-LE encoded file, but where the Client environment thinks the file is UTF-8 (as shown on the bottom line). This causes a restart-loop, because the Client is asking the Server to shutdown and then restarts it... strange. This may be a Client-side issue, related to overturetool/vdm-vscode#80.