HDL Checker v0.6.13

Changed a couple of aspects of the server suggesting to use a config file
- Only issue the notification if the user hasn't specified a config file already (fixes #77)
- Also increased the time to trigger this from 15 to 30 seconds
Invalidating cache file on version change (fixes #74)
Disable logging and stderr when starting the server via --log-stream NONE and/or --sterr NONE respectively (fixes #73)
Adding hook to __main__.py to allow python -m usage
Added some support for textDocument/references LSP method
- Please not that this only provides references for items that HDL Checker knows about to support inferring libraries and determining the compilation sequence

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