3rdparty: add MultiEmulator by 2010kohtep

* patched to be portable, turned into a static library
* integrated to the engine

3rdparty/MultiEmulator/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017-2018 Alexander Belkin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

3rdparty/MultiEmulator/README.md

@@ -0,0 +1,25 @@
+# MultiEmulator
+
+**MultiEmulator** - project for GoldSource Engine, which provides ability to generate tickets with a specific SteamID key, using all available emulators for this engine.
+
+Ticket is processed by the game server of Half-Life 1 and modifications using **DProto** or **ReUnion** modules. If the server does not have these modules, then MultiEmulator won't work.
+
+# Ticket generators
+
+Currently available ticket generators: 
+* OldRevEmu
+* AVSMP
+* Setti
+* SteamEmu
+* RevEmu
+* SC2009
+* RevEmu2013
+
+Currently under development generators:
+* SmartSteamEmu (SSE3)
+
+# How to use?
+Each file in the **MultiEmulator\Source\Emulators** folder contains a **Generate** function that writes a ticket to the **pDest** argument for the emulator of the same name as a header file. As a result of the function, the size of the written ticket is returned. If the generator can set an arbitrary SteamID, the function will have the **nSteamID** argument, in which the required SteamID is specified.
+
+# Examples
+As an example, the DLL was developed that searches InitiateGameConnection method in ISteamUser interface, which generates Steam ticket, and inserts in its place own generator, which creates RevEmu2013 ticket with SteamID equal to 3333333. You can find this project in **Example** folder, you just need to compile it and perform DLL injection in hl.exe process with any known injection method.

3rdparty/MultiEmulator/include/multi_emulator.h

@@ -0,0 +1,37 @@
+#ifndef MULTI_EMULATOR_H
+#define MULTI_EMULATOR_H
+
+#if defined( __GNUC__ )
+	#if defined( __i386__ )
+		#define ME_EXPORT         __attribute__(( visibility( "default" ), force_align_arg_pointer ))
+	#else
+		#define ME_EXPORT         __attribute__(( visibility ( "default" )))
+	#endif
+#else
+	#if defined( _MSC_VER )
+		#define ME_EXPORT         __declspec( dllexport )
+	#else
+		#define ME_EXPORT
+	#endif
+#endif
+
+#include <string.h>
+
+#if __cplusplus
+extern "C"
+{
+#endif
+
+int ME_EXPORT GenerateRevEmu2013( void *pDest, int nSteamID );
+int ME_EXPORT GenerateSC2009( void *pDest, int nSteamID );
+int ME_EXPORT GenerateOldRevEmu( void *pDest, int nSteamID );
+int ME_EXPORT GenerateSteamEmu( void *pDest, int nSteamID );
+int ME_EXPORT GenerateRevEmu( void *pDest, int nSteamID );
+int ME_EXPORT GenerateSetti( void *pDest );
+int ME_EXPORT GenerateAVSMP( void *pDest, int nSteamID, int bUniverse );
+
+#if __cplusplus
+}
+#endif
+
+#endif // MULTI_EMULATOR_H

3rdparty/MultiEmulator/src/AVSMP.cpp

@@ -0,0 +1,13 @@
+#include "multi_emulator.h"
+
+/* bUniverse param is "y" value in "STEAM_x:y:z" */
+int GenerateAVSMP(void *pDest, int nSteamID, int bUniverse)
+{
+	auto pTicket = (int *)pDest;
+
+	pTicket[0] = 0x14;                                    //  +0, header
+	pTicket[3] = (nSteamID << 1) | (bUniverse ? 1 : 0);   // +12, SteamId, Low part
+	pTicket[4] = 0x01100001;                              // +16, SteamId, High part
+
+	return 28;
+}