SOC_U: Preliminary implementation of sockets.

Stubbed CreateMemoryBlock

Using Berkeley sockets, and Winsock2.2 on Windows.
So far ftpony creates the socket and accepts incoming connections

SOC_U: Renamed functions to maintain consistency

Also prevents possible scope errors / conflicts with the actual Berkeley socket functions

SOCU: Close all the opened sockets when cleaning up SOCU

src/common/logging/backend.cpp

@@ -39,6 +39,7 @@ static std::shared_ptr<Logger> global_logger;
         SUB(Service, CFG) \
         SUB(Service, DSP) \
         SUB(Service, HID) \
+        SUB(Service, SOC) \
         CLS(HW) \
         SUB(HW, Memory) \
         SUB(HW, GPU) \