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]

This issues was copied from nickbattle/vdmj#78, as it may be a Client side issue?

It may be related to the work we did for #80.