Add unix socket support for SphinxAPI connection

Feel free to edit the comment as needed, I'm not a very good writer, lol.

I also replaced is_numeric() with ctype_digit() because it is a faster/simpler check that is also more accurate when dealing with ports.
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Merge branch 'sphinxapi_unix_socket' of https://github.com/josh4trunks/nZEDb into josh4trunks-sphinxapi_unix_socket

Conflicts:
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Fixing for code standards. Adding additional sanity checking.
Updating Changelog.