Partial CNetChan class rebuild and implementation (see description)

* Adapt codebase to new class to reduce rune-like code.
* Fixed several bugs where the global CClient pointer was used instead of the instance in question to issue bans and display information about a certain client in CBanSystem and Pylon.
* Upgraded CBanSystem and Pylon to use IPv6 instead (including IPv4 mapped IPv6 addresses). This breaks all existing banlist files! All bans have to be re-issued or the existing file has to be updated to use IPv4 mapped IPv6 addresses and renamed to 'banlist.json', and moved to the root of the 'platform' folder.

r5dev/core/init.cpp

@@ -144,7 +144,7 @@ void Systems_Init()
 #endif // DEDICATED || GAMEDLL_S3
 	//CModelLoader_Attach();
 
-	CNetChan_Attach();
+	NET_Attach();
 	ConCommand_Attach();
 	IConVar_Attach();
 	CKeyValueSystem_Attach();
@@ -245,7 +245,7 @@ void Systems_Shutdown()
 #endif // DEDICATED || GAMEDLL_S3
 	//CModelLoader_Detach();
 
-	CNetChan_Detach();
+	NET_Detach();
 	ConCommand_Detach();
 	IConVar_Detach();
 	CKeyValueSystem_Detach();

r5dev/core/stdafx.h

@@ -64,6 +64,10 @@
 #include "tier0/platform.h"
 #include "common/pseudodefs.h"
 
+// Common type declarations to reduce code verbosity.
+using std::string;
+using std::vector;
+
 #if !defined(SDKLAUNCHER) && !defined (NETCONSOLE)
 namespace
 {