Add support for other platforms

[The-Voidwalker]

• Add support for other platforms to CertificateStore.
• The openssl dlls included in this project are compiled for Windows and will not work on other platforms. We can see about compiling them for other platforms, but for linux especially, we can likely use a pre-built version on the system.
• Some constants, such as AF_INET6 are different across different platforms. It will be necessary to determine their value at runtime.