Refactor Networking

[MDFL64]

[SwadicalRag]

C++ networking now uses structs. I'm using a nasty compiler hack to compile the structs with the exact offsets. I'm not sure if this will be a problem in platforms that don't use msvc/gcc. We'll have to see.

If we have any further issues with the new networking style, I suggest going for a better solution like protobufs.

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Lua networking should stop using the bitbuf from sourcenet and instead use a lua implemented bitbuf

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For now I'm happy with your networking mode (first byte decides where the packet is routed) I'll see where I can take this in the future.

[SwadicalRag]

Checklist:

• Fix C++ networking and replace C++ bitbuf with structs
• Remove gm_sourcenet and lua bindings to the C++ bitbuf