Fixing some win32 sockets misuses

Adding Visual Studio filters.

Fixing a suspicious-looking paradigm in murmur_hash.c

The current code is using the same variable name twice, k1, in two different scopes.
A cursory inspection of the code looks like one is trying to sneak a vulnerability by
masking off the reset of the k1 variable out of the loop; which is, in fact, what the
official algorithm does explicitely.

I guess this is a result of the C89-ization of the official algorithm, with the second
k1 variable usually defined AFTER the loop.

This change brings more sanity to the algorithm, making it much better-looking by
removing all ambiguity in what we're doing. The end result is exactly the same, but
at least we're explicit about it.

Bring the rest of Python RPC Framework into GRPC.

Creds

Docker

removing commented out line

Factoring visual studio code into a buildgen plugin.

Remove more uses of sprintf

Remove uses of sprintf