Fix various compiler warnings

P4:10594986,10594987,10594988,10594991
(cherry picked from commit f3ebc72)

Author: mikela-valve

src/steamnetworkingsockets/clientlib/csteamnetworkingmessages.cpp

@@ -464,7 +464,7 @@ EResult CSteamNetworkingMessages::SendMessageToUser( const SteamNetworkingIdenti
 		}
 
 		// Try to create one
-		SteamNetworkingConfigValue_t opt[1];
+		SteamNetworkingConfigValue_t opt[ 1 ] = {};
 		opt[0].SetInt32( k_ESteamNetworkingConfig_SymmetricConnect, 1 );
 		ConnectionScopeLock connectionLock2;
 		pConn = m_steamNetworkingSockets.InternalConnectP2PDefaultSignaling( identityRemote, k_nVirtualPort_Messages, 1, opt, connectionLock2 );

src/steamnetworkingsockets/clientlib/csteamnetworkingsockets.cpp

@@ -1555,7 +1555,7 @@ bool CSteamNetworkingSockets::CreateSocketPair( HSteamNetConnection *pOutConnect
 	// Assume failure
 	*pOutConnection1 = k_HSteamNetConnection_Invalid;
 	*pOutConnection2 = k_HSteamNetConnection_Invalid;
-	SteamNetworkingIdentity identity[2];
+	SteamNetworkingIdentity identity[ 2 ] = {};
 	if ( pIdentity1 )
 		identity[0] = *pIdentity1;
 	else

src/steamnetworkingsockets/clientlib/steamnetworkingsockets_lowlevel.cpp

@@ -3428,7 +3428,7 @@ static void SteamNetworkingThreadProc()
 
 	#if defined(_WIN32) && !defined(__GNUC__)
 
-		#pragma warning( disable: 6132 ) // Possible infinite loop:  use of the constant EXCEPTION_CONTINUE_EXECUTION in the exception-filter expression of a try-except.  Execution restarts in the protected block.
+		#pragma warning( disable: 6312 ) // Possible infinite loop:  use of the constant EXCEPTION_CONTINUE_EXECUTION in the exception-filter expression of a try-except.  Execution restarts in the protected block.
 
 		typedef struct tagTHREADNAME_INFO
 		{

src/steamnetworkingsockets/clientlib/steamnetworkingsockets_snp.cpp

@@ -717,7 +717,7 @@ bool CSteamNetworkConnectionBase::ProcessPlainTextDataChunk( int usecTimeSinceLa
 	#define READ_24BITU( var, pszWhatFor ) \
 		do { EXPECT_BYTES(3,pszWhatFor); \
 			var = *(uint8 *)pDecode; pDecode += 1; \
-			var |= uint32( LittleWord(*(uint16 *)pDecode) ) << 8U; pDecode += 2; \
+			var |= uint64( LittleWord(*(uint16 *)pDecode) ) << 8U; pDecode += 2; \
 		} while(false)
 
 	#define READ_32BITU( var, pszWhatFor ) \