Implement a simple http client to avoid depending on a system http client library

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[UnknownShadow200]

Still to go:

• Session caching (i.e reuse sockets)
• Proper HTTP redirection behaviour
• Proper socket timeouts
• Increase read buffer size?

Less important

• Hostname to multiple IP addresses support
• Avoid extra Mem_Copy when decoding large HTTP data downloads

When implementing session caching, need to make sure it behaves properly across system suspend/resume