Improvements I made on my end#2

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schellingb wants to merge 12 commits intokieselsteini:masterfrom

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Commits on Apr 7, 2017

Add extern "C" to header section for mixed C/C++ project
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Add optional define STS_NET_NO_ERRORSTRINGS to remove error strings from build
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Define _WINSOCK_DEPRECATED_NO_WARNINGS to remove build warnings
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Added sts_net_gethostname function to query the host name (or ip address) of a connected client (or the listen interface of a server)
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Fix build error when compiling against C89 standard
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Fix memcpy to use sts__ macro in sts_net_gethostname
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Added sts_net_enumerate_interfaces to get a list of interface names and ip-addresses of the host machine
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Improved socket opening and socket sets
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Added sts_net_check_socket to check just a single socket
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Commits on Apr 9, 2017

Fixed some more compile warnings on stricter warning levels
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Commits on Jun 18, 2017

fix possible missing ptrdiff_t on non-windows platforms
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Commits on May 22, 2020

added basic udp functionality (sts_net_udp_*)
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