Add numeric-version option for wrapper and server #241
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closes #238
Also correctly shuts down the language server if
--version
was given.Minor rework of argument parser.
This might cause breakage, since combinations such as
haskell-language-server --version --lsp
used to be valid but are not anymore. Not sure if and how important that is, though. I think we can change it if it is important, but we might lose the stronger types or increase the complexity of the arguments parser.